( Bronze ( ( is ( ( an alloy ) ( ( made out ) ( ( of ( , ( yes , ) ) ) ( ( ( tin , ) and ) copper ) ) ) ) ) . ) )
(ROOT (S (NP (NN Bronze)) (VP (VBZ is) (NP (NP (DT an) (NN alloy)) (VP (VBN made) (PRT (RP out)) (PP (IN of) (PRN (, ,) (INTJ (UH yes)) (, ,)) (NP (NP (NN tin)) (, ,) (CC and) (NP (NN copper))))))) (. .)))
Bronze is an alloy made out of, yes, 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))))) (. .)))