( ( ( element , ) ( ( chemical ( A substance ) ) ( that ( ( can not ) ( be ( ( decomposed ( into ( simpler substances ) ) ) ( by ( chemical means ) ) ) ) ) ) ) ) . )
(ROOT (NP (NP (NN element)) (, ,) (NP (NP (JJ chemical) (DT A) (NN substance)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (RB not) (VP (VB be) (VP (VBN decomposed) (PP (IN into) (NP (JJR simpler) (NNS substances))) (PP (IN by) (NP (NN chemical) (NNS means))))))))) (. .)))
element, chemical A substance that cannot be decomposed into simpler substances by chemical means.
(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))))))))))) (. .)))