Complex sentence: In 1873 Thomas and Mary Brown founded the town of Chewelah, they continued using the Salish name for the area as a reference to the winding patterns of the rivers that flowed through the Chewelah Valley.
Split into simpler sentences: In 1873 Thomas and Mary Brown founded the town of Chewelah. They continued using the Salish name for the area as a reference to the winding patterns of the rivers that flowed through the Chewelah Valley.