( ( Stars ( ( much ( more massive ) ) ( than ( our sun ) ) ) ) ( ( ( ( ( end ( their ( normal lives ) ) ) ( in ( violent ( supernova explosions ) ) ) ) , ) ( leaving ( behind ( an ( ( extremely dense ) ( neutron star ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Stars)) (ADJP (ADJP (RB much) (RBR more) (JJ massive)) (PP (IN than) (NP (PRP$ our) (NN sun))))) (VP (VBP end) (NP (PRP$ their) (JJ normal) (NNS lives)) (PP (IN in) (NP (JJ violent) (NN supernova) (NNS explosions))) (, ,) (S (VP (VBG leaving) (PP (IN behind) (NP (DT an) (ADJP (RB extremely) (JJ dense)) (NN neutron) (NN star)))))) (. .)))
Stars much more massive than our sun end their normal lives in violent supernova explosions, leaving behind an extremely dense neutron star.
(ROOT (S (NP (NN Neutron) (NNS stars)) (VP (VBP are) (NP (NP (DT the) (NNS corpses)) (PP (IN of) (NP (ADJP (VBN left) (RP over)) (NN supernova) (NNS explosions))))) (. .)))