Complex sentence: Matthews also worked closely Coast Salish elders including Tom Sampson, the late Earle Claxton, the late Ray Sam and John Elliott who provided extensive advice regarding the Salish Sea and the First People's interactions and special relationships with the ocean and marine life through the generations.
Split into simpler sentences: Matthews also worked closely Coast Salish elders including Tom Sampson, the late Earle Claxton, the late Ray Sam and John Elliott. The elders provided extensive advice regarding the Salish Sea and the First People's interactions and special relationships with the ocean and marine life through the generations.