( ( ( Supernovae and ) neutron ) ( stars . ) )
(ROOT (S (NP (NN Supernovae) (CC and) (NN neutron)) (VP (VBZ stars)) (. .)))
Supernovae and neutron stars.
(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))))) (. .)))