( ( ( ( ( ( ( Matter and ) energy ) ( ( can not ) ( be ( ( created or ) destroyed ) ) ) ) , ) but ) ( they ( can ( be interchanged ) ) ) ) . )
(ROOT (S (S (NP (NN Matter) (CC and) (NN energy)) (VP (MD can) (RB not) (VP (VB be) (VP (VBN created) (CC or) (VBN destroyed))))) (, ,) (CC but) (S (NP (PRP they)) (VP (MD can) (VP (VB be) (VP (VBN interchanged))))) (. .)))
Matter and energy cannot be created or destroyed , but they can be interchanged.
(ROOT (S (NP (NNP Matter)) (VP (MD can) (RB not) (VP (VB be) (VP (VBN created) (CC or) (VBN destroyed) (PP (IN in) (NP (DT a) (NN chemical) (NN reaction)))))) (. .)))