Complex sentence: Junayd then returned to Merv, leaving a token garrison of 800 men behind in Samarkand, and, once the Turgesh had withdrawn north for the winter, he evacuated the city of its Muslim inhabitants.
Split into simpler sentences: Junayd then returned to Merv, leaving a token garrison of 800 men behind in Samarkand. Once the Turgesh had withdrawn north for the winter, he evacuated the city of its Muslim inhabitants.