( ( Individual substances ) ( ( are ( called ( ( elements , ) ( substance ( which ( ( can not ) ( be ( ( ( broken down ) or ) ( subdivided ( by ( ordinary ( chemical means ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Individual) (NNS substances)) (VP (VBP are) (VP (VBN called) (NP (NP (NNS elements)) (, ,) (NP (NP (NN substance)) (SBAR (WHNP (WDT which)) (S (VP (MD can) (RB not) (VP (VB be) (VP (VP (VBN broken) (PRT (RP down))) (CC or) (VP (VBN subdivided) (PP (IN by) (NP (JJ ordinary) (NN chemical) (NNS means))))))))))))) (. .)))
Individual substances are called elements , substance which cannot be broken down or subdivided by ordinary chemical means.
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (DT a) (JJ pure) (NN substance)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (RB not) (VP (VB be) (VP (VBN broken) (ADVP (RB down) (PP (IN into) (NP (NP (JJ different) (NNS types)) (PP (IN of) (NP (NNS substances)))))) (NP (DT a) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN element))))))))) (. .)))