Complex sentence: Shipping traffic in the Great Lakes system bypasses the rapids via the American Soo Locks, the world's busiest canal in terms of tonnage passing through it, while smaller recreational and tour boats use the Canadian Sault Ste. Marie Canal.
Split into simpler sentences: Shipping traffic in the Great Lakes system bypasses the rapids via the American Soo Locks, the world's busiest canal in terms of tonnage passing through it. Smaller recreational and tour boats use the Canadian Sault Ste. Marie Canal.