( ( ( element ( A substance ) ) ( which ( ( can not ) ( be ( decomposed ( by chemical ) ) ) ) ) ) ( ( means ( into ( a ( simpler substance ) ) ) ) . ) )
(ROOT (S (NP (NP (NN element) (DT A) (NN substance)) (SBAR (WHNP (WDT which)) (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 (DT a) (JJR simpler) (NN substance)))) (. .)))
element A substance which cannot be decomposed by chemical means into a simpler substance.
(ROOT (S (NP (NP (NNS Substances)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (RB not) (VP (VB be) (VP (VBN broken) (PRT (RP down)) (PP (IN into) (NP (NP (JJR simpler) (NNS substances)) (PP (IN with) (NP (JJ different) (NNS properties))))))))))) (VP (VBP are) (VP (VBN called) (NP (NNS elements)))) (. .)))