Complex sentence: The game is set in an alternate World War II in which Adolf Hitler is assassinated in the early days of the war and under the new chancellor, Germany occupies Great Britain, yet allows the Soviet Union to advance into Western Europe.
Split into simpler sentences: The game is set in an alternate World War II in which Adolf Hitler is assassinated in the early days of the war and under the new chancellor, Germany occupies Great Britain. Eventually, Nazi Germany is defeated, but this allows the Soviet Union to advance into Western Europe.