( ( A ( supernovae explosion ) ) ( ( ( is usually ) ( associated ( with ( ( the formation ) ( of ( neutron stars ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (JJ supernovae) (NN explosion)) (VP (VBZ is) (ADVP (RB usually)) (VP (VBN associated) (PP (IN with) (NP (NP (DT the) (NN formation)) (PP (IN of) (NP (NN neutron) (NNS stars))))))) (. .)))
A supernovae explosion is usually associated with the formation of 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))))) (. .)))