( ( d -RRB- ) ( Elements ( ( ( can not ) ( be ( ( ( broken down ) ( into ( simpler substances ) ) ) ( by ( chemical means ) ) ) ) ) . ) ) )
(ROOT (S (LST (LS d) (-RRB- -RRB-)) (NP (NNP Elements)) (VP (MD can) (RB not) (VP (VB be) (VP (VBN broken) (PRT (RP down)) (PP (IN into) (NP (JJR simpler) (NNS substances))) (PP (IN by) (NP (NN chemical) (NNS means)))))) (. .)))
d) Elements cannot be broken down into simpler substances by 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))))))))))) (. .)))