Complex sentence: Tyumen again experienced rapid growth with the coming of World War 2, due to the evacuation of workers from factories in central Russia in 1941, which more than doubled its population to 150,000.
Split into simpler sentences: Tyumen again experienced rapid population growth with the coming of World War 2. The evacuation of workers from factories in central Russia in 1941 more than doubled Tyumen's population to 150,000.