enjoyable , if occasionally flawed , 
(ROOT (ADJP (ADJP (JJ enjoyable)) (, ,) (SBAR (IN if) (FRAG (FRAG (ADJP (RB occasionally)) (JJ flawed)))) (, ,)))
(ROOT (ADJP (ADJP (JJ )) (, ) (SBAR (IN ) (FRAG (FRAG (ADJP (RB )) (JJ )))) (, )))