Complex sentence: Yugoslav Danube Swabians supplied more than 60,000 troops for German military formations, some voluntarily but many more under duress, and actively participated in the sometimes brutal repression of the equally brutal Yugoslav Partisans.
Split into simpler sentences: Yugoslav Danube Swabians supplied more than 60,000 troops for German military formations, some voluntarily but many more under duress. They participated in the sometimes brutal repression of the equally brutal Yugoslav Partisans.