Complex sentence: On 1 June 1990, the 1049th Antiaircraft Artillery Regiment was disbanded and replaced by the 838th Antiaircraft Missile Regiment, transferred from the 28th Tank Division.
Split into simpler sentences: On 1 June 1990, the 1049th Antiaircraft Artillery Regiment was disbanded and replaced by the 838th Antiaircraft Missile Regiment. The 838th was transferred from the 28th Tank Division.