( So ( ( ( ( massive and ) dense ) ( does ( the ( central core ) ) ) ) ( ( become ( that ( ( ( nuclear ( fusion bursts ) ) ( on ( ( ( ( the scene ) , ) and ) ( a ( young star ) ) ) ) ) ( begins ( to shine ) ) ) ) ) . ) ) )
(ROOT (S (RB So) (PRN (NP (JJ massive) (CC and) (JJ dense)) (VP (VBZ does) (NP (DT the) (JJ central) (NN core)))) (VP (VB become) (SBAR (IN that) (S (NP (NP (JJ nuclear) (NN fusion) (NNS bursts)) (PP (IN on) (NP (NP (DT the) (NN scene)) (, ,) (CC and) (NP (DT a) (JJ young) (NN star))))) (VP (VBZ begins) (S (VP (TO to) (VP (VB shine)))))))) (. .)))
So massive and dense does the central core become that nuclear fusion bursts on the scene, and a young star begins to shine.
(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))))) (. .)))