( ( An element ) ( ( is ( ( a substance ) ( that ( ( can not ) ( be ( chemically ( divided ( into ( a ( simpler substance ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (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 (ADVP (RB chemically)) (VBN divided) (PP (IN into) (NP (DT a) (JJR simpler) (NN substance)))))))))) (. .)))
An element is a substance that cannot be chemically divided into a simpler substance.
(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))))))))) (. .)))