Complex sentence: Vadim Valentinovich Zagladin (June 23,1927-November 17,2006), Soviet politician and ideologist, was one of the leading theoreticians of Perestroika.
Split into simpler sentences: Vadim Valentinovich Zagladin (June 23,1927-November 17,2006) was a Soviet politician and ideologist. Vadim Zagladin was one of the leading theoreticians of Perestroika.