(S (S (S (PP (IN At) (NP (BASENP (DT the) (NN end)) (PP (IN of) (BASENP (NN 2011))))) (S (BASENP (NNP Arab) (NNP League) (NNS observers)) (VP (VBD had) (VP (VP (VP (VP (VBN sent) (PRT (RP out))) (BASENP (NNS observers))) (PP (TO to) (NP (BASENP (JJ different) (NNS cities)) (PP (IN in) (BASENP (NNP Syria)))))) (S (VP (TO to) (VP (VB monitor) (BASENP (DT the) (NN situation))))))))) (COMMA ,) (SBAR (IN whilst) (S (NP (BASENP (NN one)) (PP (IN of) (BASENP (PRPD its) (NNS advisers)))) (VP (VBD called) (SBAR (IN for) (S (S (BASENP (DT the) (NN organization)) (VP (TO to) (VP (VB retreat)))) (SBAR (IN after) (S (NP (BASENP (NNP Al-Assad) (POS 's)) (NN government)) (VP (VBD reneged) (PP (IN on) (NP (NNS agreements) (S (VP (TO to) (VP (VB halt) (BASENP (DT the) (NN crackdown)))))))))))))))) (PERIOD .))