Complex sentence: It was subordinated by OKW/Chi in 1939, but little is known about it since staff escaped to Werfen at the end of the war and they were never interrogated by TICOM.
Split into simpler sentences: It was subordinated by OKW/Chi in 1939, but little is known about it. Little is known about it, since staff escaped to Werfen at the end of the war and they were never interrogated by TICOM.