Complex sentence: After an uneventful career she was requisitioned by the KM for use as a commerce raider, she was converted for this purpose by Blohm and Voss in the winter of 1939, and commissioned as the raider Widder on 9 December of that year.
Split into simpler sentences: After an uneventful career she was requisitioned by the Kriegsmarine for use as a commerce raider. She was converted for this purpose by Blohm and Voss in the winter of 1939, and commissioned as the raider "Widder" on 9 December of that year.