Complex sentence: Shirou is not the true winner of the Grail War in this route, as he lost his servant and command seals, however Kirei Kotomine, still proclaims him to be the winner.
Split into simpler sentences: Shirou is not the true winner of the Grail War in this route, as he lost his servant and command seals. However, Kirei Kotomine, still proclaims him to be the winner.