while retaining an integrity and refusing to compromise his vision 
(ROOT (SBAR (IN while) (S (VP (VP (VBG retaining) (NP (DT an) (NN integrity))) (CC and) (VP (VBG refusing) (S (VP (TO to) (VP (VB compromise) (NP (PRP$ his) (NN vision))))))))))
(ROOT (SBAR (IN ) (S (VP (VP (VBG ) (NP (DT ) (NN ))) (CC ) (VP (VBG ) (S (VP (TO ) (VP (VB ) (NP (PRP$ ) (NN ))))))))))