( ( ( brass ( A ( yellowish alloy ) ) ) ( ( consisting mainly ) ( of ( ( copper and ) zinc ) ) ) ) . )
(ROOT (NP (NP (NP (NN brass)) (NP (DT A) (JJ yellowish) (NN alloy))) (VP (VBG consisting) (ADVP (RB mainly)) (PP (IN of) (NP (NN copper) (CC and) (NN zinc)))) (. .)))
brass A yellowish alloy consisting mainly of copper and zinc.
(ROOT (S (NP (NNP Brass) (NNP alloy)) (VP (VBZ is) (VP (VBN made) (PP (IN from) (NP (NN copper) (CC and) (NN zinc))))) (. .)))