(S (S (S (S (S (BASENP (NN 52) (NNS people)) (VP (VBD were) (VP (VBN killed)))) (CC and) (S (BASENP (QP (NNS hundreds) (JJR more))) (VP (VBN injured)))) (PP (IN on) (BASENP (NNP July) (NN 7th) (NN 2005)))) (SBAR (WHADVP (WRB when)) (S (BASENP (NN four) (NN suicide) (NNS bombers)) (VP (VP (VP (VBD blew) (BASENP (PRP themselves))) (PRT (RP up))) (PP (IN on) (NP (BASENP (NN three) (JJ separate) (NNP London) (NNP Underground) (NNS trains)) (CC and) (BASENP (DT a) (JJ public) (NN bus)))))))) (PERIOD .))