Complex sentence: Horseshoe Park is a flat at in elevation in Larimer County, Colorado and within the Rocky Mountain National Park, which lies between Estes Park to the east and Grand Lake, Colorado on the west.
Split into simpler sentences: Horseshoe Park is a flat at in elevation in Larimer County, Colorado. It is within the Rocky Mountain National Park, which lies between Estes Park to the east and Grand Lake, Colorado on the west.