Complex sentence: Born Prince Vasily Ivanovich Shuisky and descended from sovereign princes of Nizhny Novgorod and 20th generation male line decendant of Rurik the Viking, he was one of the leading boyars of Tsardom of Russia during the reigns of Feodor I and Boris Godunov.
Split into simpler sentences: Born Prince Vasily Ivanovich Shuisky, he was descended from sovereign princes of Nizhny Novgorod and a 20th generation male line descendant of Rurik the Viking. He was one of the leading boyars of Tsardom of Russia during the reigns of Feodor I and Boris Godunov.