( ( ( ( ( a ( composite volcano ) ) ( consists ( of cones ) ) ) and ) ( usually ( they ( are steep-sided ) ) ) ) . )
(ROOT (S (S (NP (DT a) (JJ composite) (NN volcano)) (VP (VBZ consists) (PP (IN of) (NP (NNS cones))))) (CC and) (S (ADVP (RB usually)) (NP (PRP they)) (VP (VBP are) (ADJP (JJ steep-sided)))) (. .)))
a composite volcano consists of cones and usually they are steep-sided.
(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)))))))) (. .)))