unwillingness to define his hero 's background or motivations 
(ROOT (NP (NN unwillingness) (S (VP (TO to) (VP (VB define) (NP (NP (PRP$ his) (NN hero) (POS 's)) (NN background) (CC or) (NNS motivations)))))))
(ROOT (NP (NN ) (S (VP (TO ) (VP (VB ) (NP (NP (PRP$ ) (NN ) (POS )) (NN ) (CC ) (NNS )))))))