extends to his supple understanding of the role 
(ROOT (S (VP (VBZ extends) (PP (IN to) (NP (NP (PRP$ his) (JJ supple) (NN understanding)) (PP (IN of) (NP (DT the) (NN role))))))))
(ROOT (S (VP (VBZ ) (PP (IN ) (NP (NP (PRP$ ) (JJ ) (NN )) (PP (IN ) (NP (DT ) (NN ))))))))