Complex sentence: After the German forces weakened, the Soviets launched two counter-offensives, pushing the Germans back across a broad front and retaking Orel north of the salient, and Belgorod and Kharkov to the south.
Split into simpler sentences: After the German forces weakened, the Soviets launched two counter-offensive, pushing the Germans back across a broad front. These offensives allowed the Red Army to retake Orel north of the salient, and Belgorod and Kharkov to the south.