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