( Elements ( ( Substances ( that ( ( can not ) ( be ( ( decomposed ( into ( simpler materials ) ) ) ( by ( chemical reactions ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Elements)) (VP (VBZ Substances) (SBAR (IN that) (S (VP (MD can) (RB not) (VP (VB be) (VP (VBN decomposed) (PP (IN into) (NP (JJR simpler) (NNS materials))) (PP (IN by) (NP (NN chemical) (NNS reactions))))))))) (. .)))
Elements Substances that cannot be decomposed into simpler materials by chemical reactions.
(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))))))))))) (. .)))