Complex sentence: Prince Vsevolod Ivanovich of Russia (20 January 1914-18 June 1973) was a great-great-grandson of Tsar Nicholas I of Russia and a nephew of King Alexander I of Yugoslavia.
Split into simpler sentences: Prince Vsevolod Ivanovich of Russia (20 January 1914-18 June 1973) was a direct descendant of the Tsars of Russia. He was a great-great-grandson of Tsar Nicholas I of Russia and a nephew of King Alexander I of Yugoslavia.