(S (S (SBAR (IN While) (S (BASENP (NNP Tyron)) (VP (VBD was) (VP (VP (VBN pronounced) (S (ADJP (JJ dead)))) (PP (IN at) (BASENP (DT the) (NN scene))))))) (COMMA ,) (S (BASENP (NNP Tyrel)) (VP (VP (VP (VBD underwent) (NP (BASENP (NNS hours)) (PP (IN of) (BASENP (NN surgery))))) (PP (IN at) (NP (NP (BASENP (NNPS Children) (POS 's)) (NNP Hospital)) (PP (IN in) (BASENP (NNP Pittsburgh)))))) (CC and) (VP (VBZ is) (VP (VBN expected) (S (VP (TO to) (VP (VB survive))))))))) (PERIOD .))