Complex sentence: Being among the first automatic pistol cartridges to be utilized worldwide, the.25 ACP cartridge was designed with a "semi-rimmed" case where the rim had a slightly larger diameter than the base of the cartridge and an extractor groove was cut directly above it.
Split into simpler sentences: Being among the first automatic pistol cartridges to be utilized worldwide, the.25 ACP cartridge was designed to have a "semi-rimmed" case. The rim of the casing had a slightly larger diameter than the base of the cartridge and an extractor groove was cut directly above it.