( Brass ( ( is ( ( an alloy ) ( ( made chiefly ) ( of ( ( copper and ) zinc ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Brass)) (VP (VBZ is) (NP (NP (DT an) (NN alloy)) (VP (VBN made) (ADVP (RB chiefly)) (PP (IN of) (NP (NN copper) (CC and) (NN zinc)))))) (. .)))
Brass is an alloy made chiefly 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))))) (. .)))