Complex sentence: Following the Greenbrier River, the GRT changes in elevation along its route, passing through a number of small towns, crossing 35 trestles and passing through two tunnels, Droop Mountain Tunnel and Sharps Tunnel.
Split into simpler sentences: Following the Greenbrier River, the trail passes through a number of small towns as it changes in elevation along its route. The trail includes 35 trestles and two tunnels, Droop Mountain Tunnel and Sharps Tunnel.