Complex sentence: The RAF Special Duties squadrons were air units created to support the resistance movement in Axis controlled territories, initially in Europe, but by the end of the war Special Duties units were operating in the Far East as well.
Split into simpler sentences: The RAF Special Duties squadrons were air units created to support the resistance movement in Axis controlled territories in Europe. By the end of the war Special Duties units were operating in the Far East as well.