( Elements ( ( ( do not ) ( ( break ( into ( simpler substances ) ) ) ( during ( chemical changes ) ) ) ) . ) )
(ROOT (S (NP (NNS Elements)) (VP (VBP do) (RB not) (VP (VB break) (PP (IN into) (NP (JJR simpler) (NNS substances))) (PP (IN during) (NP (NN chemical) (NNS changes))))) (. .)))
Elements do not break into simpler substances during chemical changes.
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (DT a) (NN substance)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (RB not) (VP (VB be) (VP (VBN broken) (PRT (RP down)) (PP (TO to) (NP (JJ other) (NNS substances))) (PP (IN by) (NP (NP (NN chemical) (NNS reactions)) (NP (DT an) (NN element))))))))))) (. .)))