( ( Nuclear energy ) ( ( is ( ( produced ( by ( ( the conversion ) ( of ( ( a ( small amount ) ) ( of ( ( the mass ) ( of ( ( the nucleus ) ( of ( an atom ) ) ) ) ) ) ) ) ) ) ) ( into energy ) ) ) . ) )
(ROOT (S (NP (JJ Nuclear) (NN energy)) (VP (VBZ is) (VP (VBN produced) (PP (IN by) (NP (NP (DT the) (NN conversion)) (PP (IN of) (NP (NP (DT a) (JJ small) (NN amount)) (PP (IN of) (NP (NP (DT the) (NN mass)) (PP (IN of) (NP (NP (DT the) (NN nucleus)) (PP (IN of) (NP (DT an) (NN atom))))))))))) (PP (IN into) (NP (NN energy))))) (. .)))
Nuclear energy is produced by the conversion of a small amount of the mass of the nucleus of an atom into energy.
(ROOT (S (PP (IN In) (NP (DT the) (JJ nuclear) (NN fusion) (NN process))) (, ,) (NP (CD two) (JJ light) (NNS nuclei)) (VP (VBP combine) (S (VP (TO to) (VP (VB produce) (NP (NP (DT a) (JJR heavier) (NN nucleus)) (CC and) (NP (JJ great) (NN energy))))))) (. .)))