Complex sentence: Its second formation was (re) formed in the Leningrad Military District in 1960 with headquarters at Petrozavodsk and disbanded finally after the fall of the Soviet Union in 1997-98.
Split into simpler sentences: Its second formation was (re) formed in the Leningrad Military District in 1960 with headquarters at Petrozavodsk. It finally disbanded after the fall of the Soviet Union in 1997-98.