Complex sentence: Cyrenaica suffered ruthless oppression, particularly under the fascist dictator Mussolini; about 125,000 Libyans were forced into concentration camps, about two-thirds of whom perished.
Split into simpler sentences: Cyrenaica suffered ruthless oppression, particularly under the fascist dictator Mussolini. About 125,000 Libyans were forced into concentration camps, about two-thirds of whom perished.