lost his touch , bringing off a superb performance in an admittedly middling film 
(ROOT (S (VP (VBD lost) (NP (PRP$ his) (NN touch)) (, ,) (S (VP (VBG bringing) (PRT (RP off)) (NP (DT a) (JJ superb) (NN performance)) (PP (IN in) (NP (DT an) (ADJP (RB admittedly) (JJ middling)) (NN film))))))))
(ROOT (S (VP (VBD ) (NP (PRP$ ) (NN )) (, ) (S (VP (VBG ) (PRT (RP )) (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (DT ) (ADJP (RB ) (JJ )) (NN ))))))))