( Element ( ( An element ) ( ( is ( ( a substance ) ( that ( ( can not ) ( be ( ( split chemically ) ( into ( simpler substances ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB Element)) (NP (DT An) (NN element)) (VP (VBZ is) (NP (NP (DT a) (NN substance)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (RB not) (VP (VB be) (VP (VBN split) (ADVP (RB chemically)) (PP (IN into) (NP (JJR simpler) (NNS substances)))))))))) (. .)))
Element An element is a substance that cannot be split chemically 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))))))))))) (. .)))