Complex sentence: Dogged by unreliability, legislative restrictions on licenses and being no more than a heavy semi-auto pistol, the Sanna-77 was a commercial failure; the Sanna-77 has long since ceased to be produced and is no longer commercially available.
Split into simpler sentences: Dogged by unreliability, legislative restrictions on licenses and being no more than a heavy semi-auto pistol, the Sanna-77 was a commercial failure. The Sanna-77 has long since ceased to be produced and is no longer commercially available.