mainly because blanchett and ribisi compellingly tap into a spiritual aspect of their characters ' suffering 
(ROOT (SBAR (ADVP (RB mainly)) (IN because) (S (NP (NN blanchett) (CC and) (NNP ribisi)) (ADVP (RB compellingly)) (VP (VBP tap) (PP (IN into) (NP (NP (DT a) (JJ spiritual) (NN aspect)) (PP (IN of) (NP (NP (PRP$ their) (NNS characters) (POS ')) (NN suffering)))))))))
(ROOT (SBAR (ADVP (RB )) (IN ) (S (NP (NN ) (CC ) (NNP )) (ADVP (RB )) (VP (VBP ) (PP (IN ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (NP (PRP$ ) (NNS ) (POS )) (NN )))))))))