Complex sentence: Knight's Armament Company (KAC), also known as Knight's Manufacturing Company, is an American firearms and firearms parts manufacturer, best known for producing the Rail Interface System (RIS) and the Rail Adapter System (RAS) grips for military firearms.
Split into simpler sentences: Knight's Armament Company ("KAC ", also"Knight's Manufacturing Company") is an American firearms and firearms parts manufacturer. KAC is best known for producing the Rail Interface System (RIS) and the Rail Adapter System (RAS) grips for military firearms.