Complex sentence: The city of Izhevsk was also renamed after him from 1984 to 1987; however, under Mikhail Gorbachev, cities that had been renamed for recent Soviet leaders were reverted to their former names.
Split into simpler sentences: The city of Izhevsk was also renamed after him. However, under Mikhail Gorbachev, cities that had been renamed for recent Soviet leaders were reverted to their former names.