feels like the work of someone who may indeed have finally aged past his prime ... and , perhaps more than he realizes , 
(ROOT (S (VP (VBZ feels) (PP (IN like) (NP (NP (DT the) (NN work)) (PP (IN of) (NP (NP (NP (NN someone)) (SBAR (WHNP (WP who)) (S (VP (MD may) (ADVP (RB indeed)) (VP (VB have) (ADVP (RB finally)) (VP (VBN aged) (PP (IN past) (NP (PRP$ his) (NN prime))))))))) (, ...) (CC and) (, ,) (ADVP (ADVP (RB perhaps) (RBR more)) (SBAR (IN than) (S (NP (PRP he)) (VP (VBZ realizes)))))))))) (, ,)))
(ROOT (S (VP (VBZ ) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NP (NP (NN )) (SBAR (WHNP (WP )) (S (VP (MD ) (ADVP (RB )) (VP (VB ) (ADVP (RB )) (VP (VBN ) (PP (IN ) (NP (PRP$ ) (NN ))))))))) (, ) (CC ) (, ) (ADVP (ADVP (RB ) (RBR )) (SBAR (IN ) (S (NP (PRP )) (VP (VBZ )))))))))) (, )))