Complex sentence: However new gun sales in the United States lagged in the 1990's, some of which was attributed to the Federal Assault Weapons Ban of 1994, a demoralizing hit for the entire firearms industry.
Split into simpler sentences: However new gun sales in the United States lagged in the 1990's, some of which was attributed to the Federal Assault Weapons Ban of 1994. The Ban was a demoralizing hit for the entire firearms industry.