Complex sentence: Lake of the Woods is over seventy miles long and wide, and contains over 14,552 islands and 65,000 miles (105,000 km) of shoreline, which would amount to the longest coastline of any Canadian lake, except that the lake is not entirely within Canada.
Split into simpler sentences: Lake of the Woods is over seventy miles long and wide, and contains more than 14,552 islands and 65,000 miles (105,000 km) of shoreline. It would amount to the longest coastline of any Canadian lake, except that the lake is not entirely within Canada.