Original sentence: Their tests were done using a shotgun, which failed to disintegrate even when the barrel had a 4 inch spike welded into it (the accident cited above that killed Brandon Lee involved a loose bullet that was subsequently propelled with lethal force by a second, separate firing with a blank cartridge, and not a catastrophic failure of the weapon)
Edited sentence: The accident cited above that killed Brandon Lee involved a loose bullet that was subsequently propelled with lethal force by a second, separate firing with a blank cartridge, and not a catastrophic failure of the weapon.Their tests were done using a shotgun, which failed to disintegrate even when the barrel had a 4 inch spike welded into it