( ( ( ( ( The ( Bronze Age ) ) , ) ( which ( succeeded ( the ( Copper Age ) ) ) ) ) , ) ( ( ( was again ) ( ( heralded ( by ( ( the invention ) ( of ( ( bronze , ) ( ( an alloy ) ( of copper ) ) ) ) ) ) ) ( with ( the ( non-ferrous ( metal tin ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN Bronze) (NN Age)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBD succeeded) (NP (DT the) (NN Copper) (NN Age))))) (, ,)) (VP (VBD was) (ADVP (RB again)) (VP (VBN heralded) (PP (IN by) (NP (NP (DT the) (NN invention)) (PP (IN of) (NP (NP (NN bronze)) (, ,) (NP (NP (DT an) (NN alloy)) (PP (IN of) (NP (NN copper)))))))) (PP (IN with) (NP (DT the) (JJ non-ferrous) (NN metal) (NN tin))))) (. .)))
The Bronze Age, which succeeded the Copper Age, was again heralded by the invention of bronze, an alloy of copper with the non-ferrous metal tin.
(ROOT (S (NP (NN Bronze)) (VP (VBZ is) (NP (NP (DT an) (NN alloy)) (PP (IN of) (NP (NN copper) (CC and) (NN tin))))) (. .)))