( ( Although ( they ( are numerous ) ) ) ( , ( they ( ( ( ( are usually ) not ) ( as ( large ( as ( composite volcanoes ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Although) (S (NP (PRP they)) (VP (VBP are) (NP (JJ numerous))))) (, ,) (NP (PRP they)) (VP (VBP are) (ADVP (RB usually)) (RB not) (ADJP (RB as) (JJ large) (PP (IN as) (NP (JJ composite) (NNS volcanoes))))) (. .)))
Although they are numerous, they are usually not as large as composite volcanoes.
(ROOT (S (NP (DT A) (NN crater)) (VP (MD can) (ADVP (RB usually)) (VP (VB be) (VP (VBN found) (PP (IN on) (NP (NP (DT the) (NN top)) (PP (IN of) (NP (JJ composite) (NNS volcanoes)))))))) (. .)))