(S (S (S (BASENP (DT The) (NN rocket)) (VP (ADVP (RB apparently)) (VP (VBD exploded) (PP (BASENP (NN 137) (NNS seconds)) (PP (IN after) (BASENP (NN launch))))))) (COMMA ,) (SBAR (WHADVP (WRB when)) (S (S (BASENP (DT a) (NN flash)) (VP (VBD was) (VP (VBN seen) (PP (IN from) (BASENP (DT an) (JJ on-board) (NN camera)))))) (CC and) (S (BASENP (NN communication)) (VP (VBD was) (VP (VBN lost))))))) (PERIOD .))