Complex sentence: A Khazar "tudun" (ruler) was resident at Chersonesos already in 690 AD, despite the fact that this town was nominally subject to the Byzantine Empire: anyway, the Byzantine emperors controlled the southern shores of the Crimea peninsula until the XIII century.
Split into simpler sentences: A Khazar "tudun" (ruler) was resident at Chersonesos already in 690 AD, despite the fact that this town was nominally subject to the Byzantine Empire. Anyway, the Byzantine emperors controlled the southern shores of the Crimea peninsula until the XIII century.