(S (S (S (BASENP (NN 30) (NNS people)) (VP (VBD were) (VP (VBN injured)))) (COMMA ,) (S (NP (BASENP (NN five)) (PP (IN of) (BASENP (PRP them)))) (NP (BASENP (NNP Amtrak) (NNS personnel)) (SBAR (WHNP (WP who)) (S (VP (VBD were) (VP (ADVP (RBS most) (RB seriously)) (VBN injured)))))))) (PERIOD .))