(S (S (S (BASENP (NN Oil) (NNS prices)) (VP (VP (VBD rose) (ADVP (RB dramatically))) (PP (IN on) (BASENP (NNP Monday))))) (SBAR (IN after) (S (BASENP (DT a) (JJ major) (JJ Alaskan) (NN oil) (NN field)) (VP (VP (VP (VBD shut) (PRT (RP down))) (BASENP (NNS operations))) (COMMA ,) (S (VP (VBG halving) (NP (BASENP (DT the) (JJ total) (NN output)) (PP (IN of) (NP (BASENP (NN oil)) (PP (IN from) (BASENP (NNP Alaska)))))))))))) (PERIOD .))