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