( ( If ( ( the nucleus ) ( ( ( ( is ( broken apart ) ) , ) or ) split ) ) ) ( , ( it ( ( ( releases energy ) ( in ( ( a process ) ( called ( nuclear fission ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (DT the) (NN nucleus)) (VP (VP (VBZ is) (VP (VBN broken) (ADVP (RB apart)))) (, ,) (CC or) (VP (VBD split))))) (, ,) (NP (PRP it)) (VP (VBZ releases) (NP (NN energy)) (PP (IN in) (NP (NP (DT a) (NN process)) (VP (VBN called) (NP (JJ nuclear) (NN fission)))))) (. .)))
If the nucleus is broken apart, or split, it releases energy in a process called nuclear fission.
(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))))))) (. .)))