( ( ( Nature , ) ( in fact ) ) ( ( is ( defined ( as ( ( a principle ) ( of ( ( motion and ) change ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Nature)) (, ,) (PP (IN in) (NP (NN fact)))) (VP (VBZ is) (VP (VBN defined) (PP (IN as) (NP (NP (DT a) (NN principle)) (PP (IN of) (NP (NN motion) (CC and) (NN change))))))) (. .)))
Nature, in fact is defined as a principle of motion and change.
(ROOT (S (PP (IN In) (NP (NN science))) (, ,) (NP (NN motion)) (VP (VBZ is) (VP (VBN defined) (PP (IN as) (NP (NP (DT a) (NN change)) (PP (IN in) (NP (NN position))))))) (. .)))