Complex sentence: He was a professor at the Russian Academy of the Arts (GITIS) in Moscow (1951--1983), was awarded the USSR State Prize twice and designated the People's Artist of the USSR (1969).
Split into simpler sentences: He was a professor of Russian Academy of the Arts (GITIS) in Moscow (1951--1983). Awarded the State Prize of the USSR twice and designated the People's Artist of the USSR (1969).