Complex sentence: The western part of the voivodeship was annexed by Germany and added to the General Government, while the eastern part (including the city of Lwów) was incorporated into the Ukrainian Soviet Socialist Republic.
Split into simpler sentences: The western part of the Voivodeship was annexed by Germany and added to the General Government. But the city of Lwów was occupied by the Soviets and, together with eastern part of the Voivodeship, was incorporated into Ukrainian Soviet Socialist Republic.