( ( ( Element Substance ) ( composed ( of ( atoms ( that ( ( can not ) ( be ( ( broken down ) ( by ( ordinary ( chemical means ) ) ) ) ) ) ) ) ) ) ) ; )
(ROOT (NP (NP (NNP Element) (NNP Substance)) (VP (VBN composed) (PP (IN of) (NP (NP (NNS atoms)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (RB not) (VP (VB be) (VP (VBN broken) (PRT (RP down)) (PP (IN by) (NP (JJ ordinary) (NN chemical) (NNS means))))))))))) (: ;)))
Element Substance composed of atoms that cannot be broken down by ordinary 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))))))))))) (. .)))