Complex sentence: In 1999, Kahr Arms bought Auto-Ordnance Company, the maker of Thompson submachine guns, then owned and operated by Numrich Arms who had bought the original Auto-Ordnance started by General John T. Thompson and his investors.
Split into simpler sentences: In 1999, Kahr Arms bought Auto-Ordnance Company, the maker of Thompson submachine guns. The Auto-Ordnance Corporation purchased by Kahr Arms was not the original Auto Ordnance started by General John T. Thompson and his investors.