an emotionally strong and politically potent piece of cinema 
(ROOT (NP (NP (DT an) (ADJP (ADJP (RB emotionally) (JJ strong)) (CC and) (ADJP (RB politically) (JJ potent))) (NN piece)) (PP (IN of) (NP (NN cinema)))))
(ROOT (NP (NP (DT ) (ADJP (ADJP (RB ) (JJ )) (CC ) (ADJP (RB ) (JJ ))) (NN )) (PP (IN ) (NP (NN )))))