has finally , to some extent , warmed up to him 
(ROOT (VP (VBZ has) (ADVP (RB finally)) (, ,) (PP (IN to) (NP (DT some) (NN extent))) (, ,) (VP (VBN warmed) (PRT (RP up)) (PP (IN to) (NP (PRP him))))))
(ROOT (VP (VBZ ) (ADVP (RB )) (, ) (PP (IN ) (NP (DT ) (NN ))) (, ) (VP (VBN ) (PRT (RP )) (PP (IN ) (NP (PRP ))))))