its execution and skill of its cast 
(ROOT (NP (NP (PRP$ its) (NN execution) (CC and) (NN skill)) (PP (IN of) (NP (PRP$ its) (NN cast)))))
(ROOT (NP (NP (PRP$ ) (NN ) (CC ) (NN )) (PP (IN ) (NP (PRP$ ) (NN )))))