Complex sentence: The German tactics used for urban warfare in Berlin were dictated by three considerations: the experience that the Germans had gained during five years of war, the physical characteristics of Berlin, and the tactics used by the Soviets.
Split into simpler sentences: The German tactics used for the urban warfare in Berlin were dictated by three considerations. These were: the experience that the Germans had gained during five years of war; the physical characteristics of Berlin; and the tactics used by the Soviets.