Complex sentence: From then until 1992 Altenburg-Nobitz was used as a fighter base by the Soviet Air Force, with successive types of MiG fighters being based there, principally the MiG-21 and latterly the MiG-29.
Split into simpler sentences: From then until 1992 Altenburg-Nobitz was used as a fighter base by the Soviet Air Force. Successive types of MiG fighters were based there, principally the MiG-21 and latterly the MiG-29.