Complex sentence: By early October of that year, Lewis' force had marched downstream to the mouth of the Kanawha River, currently the site of Pt. Pleasant, West Virginia, where they fought a famous but indecisive battle against a Shawnee force led by Hokoleskwa, or Cornstalk.
Split into simpler sentences: By early October of that year, Lewis' force had marched downstream to the mouth of the Kanawha River. They fought, currently the site of Pt. Pleasant, West Virginia, where they fought a famous but indecisive battle against a Shawnee force led by Hokoleskwa, or Cornstalk.