a moving , if uneven , success . 
(ROOT (NP (NP (DT a) (VBG moving)) (, ,) (SBAR (IN if) (FRAG (ADJP (JJ uneven)))) (, ,) (NN success) (. .)))
(ROOT (NP (NP (DT ) (VBG )) (, ) (SBAR (IN ) (FRAG (ADJP (JJ )))) (, ) (NN ) (. )))