Complex sentence: Graduates from the service academies attend their institutions in an active duty status for no less than four years and are commissioned immediately upon graduation; they comprise approximately 20% of the U.S. armed forces officer corps.
Split into simpler sentences: Graduates from the service academies attend their institutions in an active duty status for no less than four years and are commissioned immediately upon graduation. They comprise approximately 20% of the U.S. armed forces officer corps.