Complex sentence: Chestnut Ridge rises in southern Indiana County and continues south-west-southwardly for 75 miles and crosses into West Virginia then gradually slopes down and finally ends southeast of Morgantown, West Virginia.
Split into simpler sentences: Chestnut Ridge rises in southern Indiana County and continues south-west-southwardly for 75 miles. The ridge crosses into West Virginia then gradually slopes down and finally ends southeast of Morgantown, West Virginia.