Complex sentence: The unit withdrew from the Kosovo region in mid-November along with the rest of the German troops in the area, and as it withdrew many Serbs and Montenegrins took revenge against the region's ethnic Albanians, especially collaborators and former members of the division.
Split into simpler sentences: The unit withdrew from the Kosovo region in mid-November along with the rest of the German troops in the area. Many Serbs and Montenegrins then took revenge against the region's ethnic Albanians, especially collaborators and former members of the division.