Complex sentence: That same year, the Marine Corps's adopted the Army's 1915 design of the Expert Pistol Qualification Badge and created it own Marine Corps Pistol Qualification Badges, which are still in use today.
Split into simpler sentences: That same year, the Marine Corps's Pistol Qualification Badges were introduced. The Marine Corps adopted the U.S. Army's 1915 design of the Expert Pistol Qualification Badge which is still in use today.