( ( As ( they say ) ) ( , ( energy ( ( ( can never ) ( be destroyed ) ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (NP (PRP they)) (VP (VBP say)))) (, ,) (NP (NN energy)) (VP (MD can) (ADVP (RB never)) (VP (VB be) (VP (VBN destroyed)))) (. .)))
As they say, energy can never be destroyed.
(ROOT (S (NP (NNP Energy) (PRP it)) (VP (MD can) (RB not) (VP (VB be) (VP (VBN destroyed)))) (. .)))