( Brass ( ( is ( ( an alloy ) ( of ( ( ( copper and ) zinc ) ( -LRB- ( ( 38 % ) -RRB- ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Brass)) (VP (VBZ is) (NP (NP (DT an) (NN alloy)) (PP (IN of) (NP (NP (NN copper) (CC and) (NN zinc)) (PRN (-LRB- -LRB-) (NP (CD 38) (NN %)) (-RRB- -RRB-)))))) (. .)))
Brass is an alloy of copper and zinc (38%).
(ROOT (S (NP (NNP Brass) (NNP alloy)) (VP (VBZ is) (VP (VBN made) (PP (IN from) (NP (NN copper) (CC and) (NN zinc))))) (. .)))