Complex sentence: In the past, the cannon salute was fired by representatives from a U.S. Army Reserve or Kentucky National Guard artillery unit, though in recent years, the salute has been fired from a replica 19th-century cannon, fired by Civil War re-enactors.
Split into simpler sentences: In the past, the cannon salute was fired by representatives from a U.S. Army Reserve or Kentucky National Guard artillery unit. In recent years, the salute has been fired from a replica 19th-century cannon, fired by Civil War re-enactors.