( ( In ( a chemical ) ) ( ( reaction matter ) ( ( ( can not ) ( be ( ( created or ) destroyed ) ) ) . ) ) )
(ROOT (S (PP (IN In) (NP (DT a) (NN chemical))) (NP (NN reaction) (NN matter)) (VP (MD can) (RB not) (VP (VB be) (VP (VBN created) (CC or) (VBN destroyed)))) (. .)))
In a chemical reaction matter cannot be created or destroyed.
(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)))))) (. .)))