Complex sentence: A deluxe model, the U22 Neos DLX with both cosmetic and performance improvements was added in 2003; the U22 Neos Carbine Kit (to convert the pistol into a long gun) in 2004.
Split into simpler sentences: A deluxe model, the U22 Neos DLX with both cosmetic and performance improvements was added in 2003. Beretta released the U22 Neos Carbine Kit (to convert the pistol into a long gun) in 2004.