(S (S (BASENP (DT The) (JJ large) (NNS crowds)) (VP (VBD were) (NP (BASENP (NN part)) (PP (IN of) (NP (BASENP (DT the) (NN reason)) (SBAR (S (BASENP (PRP it)) (VP (VP (VBD took) (BASENP (QP (RB around) (DT an)) (NN hour))) (SBAR (IN for) (S (BASENP (NN fire) (NN service) (NNS members)) (VP (TO to) (VP (VB reach) (NP (BASENP (DT the) (NN scene)) (PP (IN of) (BASENP (DT the) (NN fire)))))))))))))))) (PERIOD .))