( ( After ( the ( supernova event ) ) ) ( , ( ( the core ) ( ( may ( remain ( as ( a ( neutron star ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN After) (NP (DT the) (NN supernova) (NN event))) (, ,) (NP (DT the) (NN core)) (VP (MD may) (VP (VB remain) (PP (IN as) (NP (DT a) (NN neutron) (NN star))))) (. .)))
After the supernova event, the core may remain as a neutron star.
(ROOT (S (NP (NP (DT The) (NN core)) (PP (IN of) (NP (DT a) (NN star)))) (VP (VBZ collapses) (PP (IN during) (NP (DT a) (NN supernova))) (, ,) (S (VP (VBG forming) (NP (DT a) (NN neutron) (NN star))))) (. .)))