Complex sentence: Initially militia headed by Voskoboinik numbered no more than 200 men and assisted Germans in policing the area, committing numerous atrocities against civilian population loyal to the Soviet authorities or Soviet partisans.
Split into simpler sentences: Initially militia headed by Voskoboinik numbered no more than 200 men. It assisted Germans in policing the area, committing numerous atrocities against civilian population loyal to the Soviet authorities or Soviet partisans.