Complex sentence: During Operation Babylift, the U.S. Defense Attache Office (DAO), a branch of DIA, lost 35 personnel, but of these DIA included only five individuals on its memorial wall, excluding the remaining 30 deaths of DAO staff.
Split into simpler sentences: During Operation Babylift, the U.S. Defense Attache Office (DAO), a branch of DIA, lost 35 personnel. Of these 35, DIA included only five individuals on its memorial wall, excluding the remaining 30 deaths of DAO staff.