( Elements ( ( are ( substances ( that ( ( can not ) ( be ( ( ( broken down ) ( into ( other substances ) ) ) ( by ( chemical means ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Elements)) (VP (VBP are) (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 (JJ other) (NNS substances))) (PP (IN by) (NP (NN chemical) (NNS means)))))))))) (. .)))
Elements are substances that cannot be broken down into other substances by chemical means.
(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)))) (. .)))