( ( ( The energy ) ( that ( is released ) ) ) ( ( ( was originally ) ( stored ( in ( ( the ( chemical bonds ) ) ( of ( the reactants ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN energy)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN released)))))) (VP (VBD was) (ADVP (RB originally)) (VP (VBN stored) (PP (IN in) (NP (NP (DT the) (JJ chemical) (NNS bonds)) (PP (IN of) (NP (DT the) (NNS reactants))))))) (. .)))
The energy that is released was originally stored in the chemical bonds of the reactants.
(ROOT (S (NP (NNP Chemical) (NN energy)) (VP (VBZ is) (VP (VBN stored) (PP (IN in) (NP (DT the) (NN atom) (NNS bonds))))) (. .)))