Complex sentence: The Varangian dynasty of Ruriks has become dukes in the neighboring Kiev duchy and Turaŭ soon also became ruled by a local branch of dukes of the Rurik Dynasty.
Split into simpler sentences: The Varangian dynasty of Ruriks became dukes in the neighboring Duchy of Kiev. Soon Turaŭ also came under the dominion of a local branch of dukes of the Rurik Dynasty.