(S (S (PP (IN In) (BASENP (NN 1988))) (COMMA ,) (S (NP (BASENP (NN one)) (PP (IN of) (BASENP (DT these) (JJ chemical) (NNS attacks)))) (VP (VBD killed) (NP (QP (ADJP (ADJP (RB as) (JJ many)) (IN as)) (NN 5,000)) (NNS people))))) (PERIOD .))