( ( ( ( ( You ( can ( ( join ( different elements ) ) ( to ( make ( ( ( more complicated ) substances ) ( called compounds ) ) ) ) ) ) ) , ) but ) ( you ( ( can not ) ( ( break ( an element ) ) ( into ( ( a ( simpler kind ) ) ( of substance ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (PRP You)) (VP (MD can) (VP (VB join) (NP (JJ different) (NNS elements)) (S (VP (TO to) (VP (VB make) (NP (NP (ADJP (RBR more) (JJ complicated)) (NNS substances)) (VP (VBN called) (NP (NNS compounds)))))))))) (, ,) (CC but) (S (NP (PRP you)) (VP (MD can) (RB not) (VP (VB break) (NP (DT an) (NN element)) (PP (IN into) (NP (NP (DT a) (JJR simpler) (NN kind)) (PP (IN of) (NP (NN substance)))))))) (. .)))
You can join different elements to make more complicated substances called compounds, but you cannot break an element into a simpler kind of substance.
(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))))))))))) (. .)))