Complex sentence: The river is 65 miles (105 km) long measured from its source in Maheu Lake in Pine County, and 20 miles (32km) from its confluence with the South Fork in Carlton County just east of the Minnesota-Wisconsin border.
Split into simpler sentences: The river is 65 miles (105 km) long measured from its source in Maheu Lake in Pine County. The main branch is joined by the South Fork in Carlton County just east of the Minnesota-Wisconsin border.