( ( ( ( Energy ( can ( be changed ) ) ) but ) ( it ( ( can not ) ( be destroyed ) ) ) ) . )
(ROOT (S (S (NP (NNP Energy)) (VP (MD can) (VP (VB be) (VP (VBN changed))))) (CC but) (S (NP (PRP it)) (VP (MD can) (RB not) (VP (VB be) (VP (VBN destroyed))))) (. .)))
Energy can be changed but it cannot be destroyed.
(ROOT (S (NP (NNP Energy) (PRP it)) (VP (MD can) (RB not) (VP (VB be) (VP (VBN destroyed)))) (. .)))