Complex sentence: Mittrick was a family friend of Allen Dulles, who was a US intelligence officer based in Switzerland during the war, who later became a Director of the Central Intelligence Agency See telegram Marjorie McKittrick to Thomas McKittrick, September 25,1945.
Split into simpler sentences: Mittrick was a family friend of Allen Dulles, who was a US intelligence officer also based in Switzerland. Dulles later became a Director of the Central Intelligence Agency See telegram Marjorie McKittrick to Thomas McKittrick, September 25,1945.