Complex sentence: Evidence of their habitation has also been found in West Virginia, which is likely enough as the Cumberland Narrows pass, later called the Nemacolin Trail abutted their range, and was geographically likely navigable through valleys from their large settlement at Conestoga, Pennsylvania.
Split into simpler sentences: Evidence of their habitation has also been found in West Virginia. The Cumberland Narrows pass, later called the Nemacolin Trail, abutted their range and it was likely navigable through valleys from their large settlement at Conestoga, Pennsylvania.