Complex sentence: The USMC variant received the MV-22 designation and the Air Force variant was branded CV-22; reversed from normal procedure to prevent Ospreys in Marine service from having a conflicting designation with aircraft carriers (CV).
Split into simpler sentences: The USMC variant received the MV-22 designation and the Air Force variant received CV-22. This was reversed from normal procedure to prevent Marine Ospreys from having similar designations as aircraft carriers (CV).