( Weight ( , ( however ( , ( ( is ( ( the pull ) ( of ( gravity ( on ( an object ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (NP (NNP Weight)) (, ,) (ADVP (RB however)) (, ,) (VP (VBZ is) (NP (NP (DT the) (NN pull)) (PP (IN of) (NP (NP (NN gravity)) (PP (IN on) (NP (DT an) (NN object))))))) (. .)))
Weight, however, is the pull of gravity on an object.
(ROOT (S (NP (NNP Weight)) (VP (VBZ is) (NP (NP (DT the) (NN measure)) (PP (IN of) (NP (NP (DT the) (NN force)) (PP (IN of) (NP (NP (NN gravity)) (VP (VBG pulling) (PRT (RP down)) (PP (IN on) (NP (DT an) (NN object)))))))))) (. .)))