Complex sentence: Inspired by the successful Colt Python, the Diamondback was manufactured from 1966 to 1988 and was available in barrel lengths of 2½, 4, and 6 inches.
Split into simpler sentences: Inspired by the successful Colt Python, the Diamondback was manufactured from 1966 to 1988. It was available in barrel lengths of 2½, 4, and 6 inches.