( Bronze ( ( is ( ( an alloy ) ( of ( ( tin and ) copper ) ) ) ) . ) )
(ROOT (S (NP (NN Bronze)) (VP (VBZ is) (NP (NP (DT an) (NN alloy)) (PP (IN of) (NP (NN tin) (CC and) (NN copper))))) (. .)))
Bronze is an alloy of tin and copper .
(ROOT (S (NP (NN Bronze)) (VP (VBZ is) (NP (NP (DT an) (NN alloy)) (PP (IN of) (NP (NN copper) (CC and) (NN tin))))) (. .)))