(S (S (S (BASENP (JJ Other) (NNS children)) (VP (VBP have) (VP (VBN died)))) (SBAR (WHADVP (WRB when)) (S (NP (BASENP (DT the) (NNS walls)) (PP (IN of) (BASENP (PRPD their) (NNS houses)))) (VP (VBP have) (VP (VBN collapsed)))))) (PERIOD .))