( Motion ( ( is ( ( the change ) ( of ( position ( of ( an object ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Motion)) (VP (VBZ is) (NP (NP (DT the) (NN change)) (PP (IN of) (NP (NP (NN position)) (PP (IN of) (NP (DT an) (NN object))))))) (. .)))
Motion is the change of position of an object.
(ROOT (S (NP (NNP Motion)) (VP (MD can) (VP (VB be) (VP (VBN defined) (ADVP (RB simply)) (PP (IN as) (NP (NP (DT a) (NN change)) (PP (IN in) (NP (NN position)))))))) (. .)))