Complex sentence: Cornwall, Ontario, is central to Canada's most notorious area of smuggling due to its location and transportation links which make it a crossroads for cross-border smuggling of illicit tobacco, illegal aliens, drugs, and firearms.
Split into simpler sentences: Cornwall, Ontario, is central to Canada's most notorious area of smuggling. Its location and transportation links make it a crossroads for cross-border smuggling of illicit tobacco, illegal aliens, drugs, and firearms.