This statement is True.
Gorbachev introduced the policies of ‘Perestroika’ (reconstruction of the Soviet political and economic system) and ‘Glasnost’ (openness).
During his tenure, there were popular uprisings against Communist regimes in East European countries like Poland, Bulgaria, Czechoslovakia, etc.
The USSR ceased to exist and in its place, 15 new countries (CIS) were created (1991).