is more depressing than entertaining 
(ROOT (S (VP (VBZ is) (ADJP (ADJP (RBR more) (JJ depressing)) (PP (IN than) (FRAG (ADJP (JJ entertaining))))))))
(ROOT (S (VP (VBZ ) (ADJP (ADJP (RBR ) (JJ )) (PP (IN ) (FRAG (ADJP (JJ ))))))))