Complex sentence: The MAJCON system was in existence up until 30 April 1991, when all units became AFCON unisumber of MAJCOM wings were converted to AFCON status while retaining their four digit designation or redsignated with one to three digits.
Split into simpler sentences: The MAJCON system was in existence up until 30 April 1991, when all units became AFCON units. A number of MAJCOM wings were converted to AFCON status while retaining their four digit designation or redesignated with one to three digits.