(S (S (PP (IN During) (BASENP (DT the) (JJ last) (NNS years))) (COMMA ,) (S (BASENP (NNP Chavez)) (VP (VP (VBD relied) (PP (IN on) (BASENP (JJ high) (NN oil) (NNS prices)))) (S (VP (TO to) (VP (VB push) (BASENP (PRPD his) (JJ social) (NN agenda)))))))) (PERIOD .))