( ( ( a ( fundamental principle ) ) ( of ( classical physics ) ) ) ( that ( matter ( ( can not ) ( be ( ( created or ) destroyed ) ) ) ) ) )
(ROOT (FRAG (NP (NP (DT a) (JJ fundamental) (NN principle)) (PP (IN of) (NP (JJ classical) (NNS physics)))) (SBAR (IN that) (S (NP (NN matter)) (VP (MD can) (RB not) (VP (VB be) (VP (VBN created) (CC or) (VBN destroyed))))))))
a fundamental principle of classical physics that 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)))))) (. .)))