( ( In science ) ( we ( ( ( ( define motion ) ( as ( ( the change ) ( in position ) ) ) ) ( with time ) ) . ) ) )
(ROOT (S (PP (IN In) (NP (NN science))) (NP (PRP we)) (VP (VBD define) (NP (NN motion)) (PP (IN as) (NP (NP (DT the) (NN change)) (PP (IN in) (NP (NN position))))) (PP (IN with) (NP (NN time)))) (. .)))
In science we define motion as the change in position with time.
(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)))))))) (. .)))