Complex sentence: In 1944, a flying school was set up at Lideta airport in Addis Ababa by a group of WWII veteran African Americans using a few aircraft acquired through military aid from the US and UK; it had some 75 students by 1946.
Split into simpler sentences: In 1944, a group of WWII African-American veterans set up a flying school at Lideta airport in Addis Ababa. The nation acquired a few aircraft through military aid from the US and UK; and the school had some 75 students by 1946.