Complex sentence: In 1964 due to the changing of the town's name it possessed the name Kommunarsk Mining-Metallurgical Institute, and in 1992--it became Donbas Mining-Metallurgical Institute (DMMI).
Split into simpler sentences: In 1964 due to the changing of the town's name it possessed the name Kommunarsk Mining-Metallurgical Institute. In 1992 it became Donbas Mining-Metallurgical Institute (DMMI).