( Brass ( ( ( ( is ( ( an example ) ( of ( an alloy ) ) ) ) , ) ( being ( ( a ( homogeneous mixture ) ) ( of ( ( copper and ) zinc ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Brass)) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (DT an) (NN alloy)))) (, ,) (S (VP (VBG being) (NP (NP (DT a) (JJ homogeneous) (NN mixture)) (PP (IN of) (NP (NN copper) (CC and) (NN zinc))))))) (. .)))
Brass is an example of an alloy, being a homogeneous mixture 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))))) (. .)))