Complex sentence: The county's largest employer is the U.S. Naval Surface Warfare Center Dahlgren Division proving ground facility at Dahlgren, Virginia, which is adjacent to the 2-lane, 2-mile long Harry W. Nice Memorial Bridge carrying U.S. Highway 301 over the Potomac River.
Split into simpler sentences: The county's largest employer is the U.S. Naval Surface Warfare Center Dahlgren Division proving ground facility at Dahlgren, Virginia. It is adjacent to the 2-lane, 2-mile long Harry W. Nice Memorial Bridge carrying U.S. Highway 301 over the Potomac River.