Complex sentence: The headwaters are approximately north of the headwaters of the North Branch of the Potomac River and pass through Silver Lake before flowing north-northeast into Garrett County, Maryland, then flowing north past Oakland and roughly parallel to the West Virginia border, separated by approximately.
Split into simpler sentences: The headwaters are approximately north of the headwaters of the North Branch of the Potomac River. It flows north-northeast into Garrett County, Maryland, flowing north past Oakland and roughly parallel to the West Virginia border, separated by approximately.