Complex sentence: Kreizer retreated to Orsha and in the battle of Orsha he stalled Guderian panzer for 12 days, his resistance gave the Red Army enough time to bring reserves to man defenses along the river Dnieper.
Split into simpler sentences: Kreizer retreated to Orsha and in the battle of Orsha he stalled Guderian panzer for 12 days. His resistance gave the Red Army enough time to bring reserves to take defenses along the river Dnieper.