( ( Fusion ( Nuclear fusion ) ) ( ( is ( ( ( a type ) ( of ( nuclear reaction ) ) ) ( ( in which ) ( ( two ( atomic nuclei ) ) ( combine ( to ( ( ( form ( a ( heavier nucleus ) ) ) , ) ( releasing energy ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Fusion) (NNP Nuclear) (NN fusion)) (VP (VBZ is) (NP (NP (DT a) (NN type)) (PP (IN of) (NP (JJ nuclear) (NN reaction))) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (CD two) (JJ atomic) (NNS nuclei)) (VP (VBP combine) (S (VP (TO to) (VP (VB form) (NP (DT a) (JJR heavier) (NN nucleus)) (, ,) (S (VP (VBG releasing) (NP (NN energy)))))))))))) (. .)))
Fusion Nuclear fusion is a type of nuclear reaction in which two atomic nuclei combine to form a heavier nucleus, releasing 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))))))) (. .)))