Complex sentence: The Dieppe raid was a major operation planned by Vice-Admiral Lord Mountbatten of Combined Operations Headquarters, involving an attacking force of about 5,000 Canadians, 1,000 British troops and 50 United States Army Rangers.
Split into simpler sentences: The Dieppe raid was a major operation planned by Vice-Admiral Lord Mountbatten of Combined Operations Headquarters. The attacking force would consist of around 5,000 Canadians, 1,000 British troops, and 50 United States Army Rangers.