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I am new to tables in latex. I know that I can do this with pwidth but when I try it the table gets all unformated. How do I do it so that the Approach column gets smaller so that the table can fit inside the page?

Thanks.

documentclassarticle
usepackage[utf8]inputenc
usepackage[english]babel

begindocument
begintable
centering
labeltabelaSemEval
begintabularllc 
hline
multicolumn3c textbfSub-task A & multicolumn3ctextbfSub-task B & multicolumn3ctextbfSub-task C \
multicolumn1textbfTeam Ranks & multicolumn1textbfApproach & multicolumn1ltextbfF1 score & multicolumn1textbfTeam Ranks & multicolumn1textbfApproach & multicolumn1ltextbfF1 score & multicolumn1textbfTeam Ranks & multicolumn1textbfApproach & multicolumn1ltextbfF1 score \ 
hline
NULI & BERT & 0.829 & jhan014 & MSOC & 0.755 & vradivchev anikolov & BERT+GloVe & 0.660 \
vradivchev anikolov & BERT+GloVe & 0.815 & Amobee & CNN+token embedding & 0.739 & NLPR@SRPOL & ensemble of OpenAI,Finetune, LSTM, Transformer,SVM and Random Forest & 0.628 \
UM-IU@LING & BERT & 0.814 & HHU & LSTM & 0.719 & Fermi & ELMo embeddings+ SVM & 0.626 \
Embeddia & BERT & 0.808 & NULI & BERT & 0.716 & YNU-HPCC & & 0.621 \
MIDAS & CNN+LSTM+GRU and word embeddings & 0.807 & NIT Agartala & Logistic regression+ Linear SVC+SGD+PA & 0.708 & Embeddia & BOW+GloVe-LSTM+POS-LSTM & 0.613 \
BNU-HKBU & BERT & 0.806 & UBC NLP & Emsemble of XGBoost+AdaBoost+logistic regression & 0.706 & NoOffense & - & 0.613 \
SentiBERT & BERT & 0.804 & Pardeep & GRU & 0.700 & Amobee & CNN+token embedding & 0.591 \
NLPR@SRPOL & ensemble of OpenAI,Finetune, LSTM,Transformer,SVM and Random Forest & 0.803 & MIDAS & model based on heuristics & 0.695 & orabia & - & 0.588 \
YNUWB & CNN+word embeddings & 0.802 & NLPR@SRPOL & ensemble of OpenAI,Finetune, LSTM, Transformer,SVM and Random Forest & 0.692 & UBC NLP & Ensemble of logistic regression+AdaBoost+XGBoost & 0.586 \
LTL-UDE & BERT & 0.802 & Vadym & - & 0.692 & na14 & - & 0.586
endtabular
endtable
enddocument

Here is my suggestion on how to restructure your table. As the table was too wide to fit into the margins (even on a landscape page) I decided to put the three sub-tasks below each other instead of next to each other. I have also used the horizontal lines from the booktabs package and the tabularx package for a table that automatically is as wide as the textwidth.

documentclassarticle
usepackagetabularx
usepackagebooktabs
usepackageragged2e

begindocument

begintable
centering
labeltabelaSemEval
begintabularxlinewidth@quadquadl>RaggedRightXc 
toprule
Team ranks & Approach & F1 score \
midrule
multicolumn3ltextitSub-task A\
NULI & BERT & 0.829 \
vradivchev anikolov & BERT+GloVe & 0.815 \
UM-IU@LING & BERT & 0.814 \
Embeddia & BERT & 0.808 \
MIDAS & CNN+LSTM+GRU and word embeddings & 0.807 \
BNU-HKBU & BERT & 0.806 \
SentiBERT & BERT & 0.804 \
NLPR@SRPOL & ensemble of OpenAI,Finetune, LSTM,Transformer,SVM and Random Forest & 0.803 \
YNUWB & CNN+word embeddings & 0.802 \
LTL-UDE & BERT & 0.802 \
midrule
multicolumn3ltextitSub-task B\
jhan014 & MSOC & 0.755 \
Amobee & CNN+token embedding & 0.739 \
HHU & LSTM & 0.719\
NULI & BERT & 0.716 \
NIT Agartala & Logistic regression+ Linear SVC+SGD+PA & 0.708 \
UBC NLP & Emsemble of XGBoost+AdaBoost+logistic regression & 0.706 \
Pardeep & GRU & 0.700 \
MIDAS & model based on heuristics & 0.695 \
NLPR@SRPOL & ensemble of OpenAI,Finetune, LSTM, Transformer,SVM and Random Forest & 0.692\
Vadym & - & 0.692 \
midrule
multicolumn3ltextitSub-task C\
vradivchev anikolov & BERT+GloVe & 0.660\
NLPR@SRPOL & ensemble of OpenAI,Finetune, LSTM, Transformer,SVM and Random Forest & 0.628 \
Fermi & ELMo embeddings+ SVM & 0.626 \
YNU-HPCC & & 0.621 \
Embeddia & BOW+GloVe-LSTM+POS-LSTM & 0.613 \
NoOffense & - & 0.613 \
Amobee & CNN+token embedding & 0.591 \
orabia & - & 0.588 \
UBC NLP & Ensemble of logistic regression+AdaBoost+XGBoost & 0.586 \
na14 & - & 0.586 \
bottomrule
endtabularx
endtable

enddocument

Another possibility: a table in landscape format, playing with the margins, the font size and the separating space between columns. I removed all vertical rules, replaced the hyphens with the more appropriate endashes, and added spaces around the + signs, to make line breaking easier:

documentclassarticle
usepackage[utf8]inputenc
usepackage[english]babel
usepackageragged2e
usepackage[margin=2cm]geometry
usepackagelscape
usepackagetabularx, booktabs, makecell
renewcommandtheadfontbfseries

begindocument

beginlandscape
setlengthtabcolsep4pt
footnotesize
begintable
centering
labeltabelaSemEval
 begintabularxlinewidth*2l>RaggedRightX@cl>RaggedRightX@c
 toprule
 multicolumn3ctextbfSub-task A & multicolumn3ctextbfSub-task B & multicolumn3ctextbfSub-task C \[1ex]
 thead[l]Team Ranks &thead[l]Approach& theadF1 score,& thead[l]Team Ranks &thead[l]Approach& theadF1 score, & thead[l]Team Ranks &thead[lc]Approach& theadF1 score,\[1ex]
 cmidrule(lr)1-3cmidrule(lr)4-6cmidrule(lr)7-9
 addlinespace[2ex]
 NULI & BERT & 0.829 & jhan014 & MSOC & 0.755 & vradivchev anikolov & BERT + GloVe & 0.660 \
 vradivchev anikolov & BERT + GloVe & 0.815 & Amobee & CNN + token embedding & 0.739 & NLPR@SRPOL & ensemble of OpenAI,Finetune, LSTM, Transformer,SVM and Random Forest & 0.628 \
 UM-IU@LING & BERT & 0.814 & HHU & LSTM & 0.719 & Fermi & ELMo embeddings + SVM & 0.626 \
 Embeddia & BERT & 0.808 & NULI & BERT & 0.716 & YNU-HPCC & & 0.621 \
 MIDAS & CNN + LSTM + GRU and word embeddings & 0.807 & NIT Agartala & Logistic regression + Linear SVC + SGD + PA & 0.708 & Embeddia & BOW + GloVe-LSTM + POS-LSTM & 0.613 \
 BNU-HKBU & BERT & 0.806 & UBC NLP & Ensemble of XGBoost + AdaBoost + logistic regression & 0.706 & NoOffense & -- & 0.613 \
 SentiBERT & BERT & 0.804 & Pardeep & GRU & 0.700 & Amobee & CNN + token embedding & 0.591 \
 NLPR@SRPOL & ensemble of OpenAI, Finetune, LSTM, Transformer, SVM and Random Forest & 0.803 & MIDAS & model based on heuristics & 0.695 & orabia & -- & 0.588 \
 YNUWB & CNN + word embeddings & 0.802 & NLPR@SRPOL & ensemble of OpenAI, Finetune, LSTM, Transformer, SVM and Random Forest & 0.692 & UBC NLP & Ensemble of logistic regression + AdaBoost + XGBoost & 0.586 \
 LTL-UDE & BERT & 0.802 & Vadym & -- & 0.692 & na14 & -- & 0.586 \
 addlinespace[2ex]
 bottomrule
 endtabularx
endtable
endlandscape

enddocument