Complex sentence: The Blackfoot River begins 10 miles (16 km) northeast of the town of Lincoln, then flows westward through the town of Milltown and enters the Clark Fork River approximately five miles (8 km) east of the city of Missoula.
Split into simpler sentences: The Blackfoot River begins in western Montana 10 miles northeast of the town of Lincoln, then flows westward through the town of Milltown, Montana. It continues flowing westward, and enters the Clark Fork River approximately five miles east of the city of Missoula.