( ( ( ( ( ( The ( strong ( nuclear force ) ) ) ( ( binds ( atomic nuclei ) ) together ) ) , ) and ) ( ( ( its release ) ( in ( nuclear fusion ) ) ) ( keeps ( ( ( the sun ) and ) ( stars shining ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (JJ strong) (JJ nuclear) (NN force)) (VP (VBZ binds) (NP (JJ atomic) (NNS nuclei)) (ADVP (RB together)))) (, ,) (CC and) (S (NP (NP (PRP$ its) (NN release)) (PP (IN in) (NP (JJ nuclear) (NN fusion)))) (VP (VBZ keeps) (NP (NP (DT the) (NN sun)) (CC and) (NP (NNS stars) (VBG shining))))) (. .)))
The strong nuclear force binds atomic nuclei together, and its release in nuclear fusion keeps the sun and stars shining.
(ROOT (S (NP (NP (JJ Nuclear) (NN fusion)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ results) (PP (RB because) (IN of) (NP (NP (JJ great) (NN pressure)) (PP (IN at) (NP (NP (DT the) (NN center)) (PP (IN of) (NP (DT a) (NN star)))))))))) (, ,)) (VP (VBZ causes) (S (NP (NNS stars)) (VP (TO to) (VP (VB shine))))) (. .)))