Complex sentence: The sport received a tremendous boost in the 1960s and 1970s, and a flourishing industry manufacturing working reproductions of historic firearms now exists in the United States and Europe, particularly in northern Italy near Gardone.
Split into simpler sentences: The sport received a tremendous boost in the 1960s and 1970s. Since then a flourishing industry manufacturing working reproductions of historic firearms now exists in the United States and Europe, particularly in northern Italy near Gardone.