, his most personal work yet . 
(ROOT (FRAG (, ,) (NP (NP (PRP$ his) (ADJP (RBS most) (JJ personal)) (NN work)) (ADVP (RB yet))) (. .)))
(ROOT (FRAG (, ) (NP (NP (PRP$ ) (ADJP (RBS ) (JJ )) (NN )) (ADVP (RB ))) (. )))