it establishes its ominous mood and tension swiftly , and 
(ROOT (S (NP (PRP it)) (VP (VP (VBZ establishes) (NP (PRP$ its) (JJ ominous) (NN mood) (CC and) (NN tension)) (ADVP (RB swiftly))) (, ,) (CC and))))
(ROOT (S (NP (PRP )) (VP (VP (VBZ ) (NP (PRP$ ) (JJ ) (NN ) (CC ) (NN )) (ADVP (RB ))) (, ) (CC ))))