( ( A brass ) ( ( is ( ( an alloy ) ( of ( copper ( with zinc ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN brass)) (VP (VBZ is) (NP (NP (DT an) (NN alloy)) (PP (IN of) (NP (NP (NN copper)) (PP (IN with) (NP (NN zinc))))))) (. .)))
A brass is an alloy of copper with zinc.
(ROOT (S (NP (NNP Brass) (NNP alloy)) (VP (VBZ is) (VP (VBN made) (PP (IN from) (NP (NN copper) (CC and) (NN zinc))))) (. .)))