Complex sentence: While riding the rails and tramping around the west, Phillips returned to Salt Lake City, and joined Ammon Hennacy from the Catholic Worker Movement in establishing a mission house of hospitality named after the activist Joe Hill.
Split into simpler sentences: While riding the rails and tramping around the west, Phillips returned to Salt Lake City, where he met Ammon Hennacy from the Catholic Worker Movement. Phillips assisted him in establishing a mission house of hospitality named after the activist Joe Hill.