Complex sentence: Einsatzkommando 1/IV was disbanded in November, 1939 and Bischoff would be transferred to the city of Posen (Poznań), capital of the recently-annexed territory of Wartheland, where he took over directorship of the city's Gestapo department.
Split into simpler sentences: Einsatzkommando 1/IV was disbanded in November, 1939 and Bischoff would be transferred to the city of Posen (Poznań), capital of the recently-annexed territory of Wartheland. There he took over directorship of the city's Gestapo department.