Complex sentence: Born into a wealthy family, an heir to the industrial holdings of the Solvay family, Olivier Gendebien studied engineering at university but when World War II erupted and the Nazis occupied Belgium, he joined the Belgian resistance movement.
Split into simpler sentences: Born into a wealthy family, an heir to the industrial holdings of the Solvay family, Olivier Gendebien studied engineering at university. When World War II erupted and the Nazis occupied Belgium, he joined the Belgian resistance movement.