(S (S (S (BASENP (DT The) (NN document)) (VP (VP (VBZ goes) (PRT (RP on))) (S (VP (TO to) (VP (VB note) (SBAR (IN that) (S (BASENP (DT the) (JJ blow-out) (NN preventer)) (VP (VBD failed) (S (VP (TO to) (VP (VB operate)))))))))))) (COMMA ,) (SBAR (RB likely) (SBAR (IN because) (S (BASENP (JJ critical) (NNS components)) (VP (VP (VBD were) (RB not)) (ADJP (JJ operational))))))) (PERIOD .))