Complex sentence: The Altamaha River traverses a broad area of low population density with few significant towns or cities along it course, though there are some along its upper tributaries, such as the fall line cities of Milledgeville on the Oconee and Macon on the Ocmulgee.
Split into simpler sentences: The Altamaha River traverses a broad area of low population density with few significant towns or cities along its course. There are some along its upper tributaries, such as the fall line cities of Milledgeville on the Oconee and Macon on the Ocmulgee.