is slightly less successful than the first 
(ROOT (VP (VBZ is) (ADJP (ADJP (RB slightly) (RBR less) (JJ successful)) (PP (IN than) (NP (DT the) (JJ first))))))
(ROOT (VP (VBZ ) (ADJP (ADJP (RB ) (RBR ) (JJ )) (PP (IN ) (NP (DT ) (JJ ))))))