(S (S (BASENP (PRP He)) (VP (VP (VBD did) (RB not)) (VP (VB explain) (SBAR (WHADVP (WRB how)) (S (BASENP (DT the) (JJ forensic) (NN evidence)) (VP (MD could) (VP (VB have) (VP (VBN proven) (NP (BASENP (DT the) (JJ mental) (NN disability)) (PP (IN of) (BASENP (DT the) (NNS women)))))))))))) (PERIOD .))