Complex sentence: The Grand Canyon Association is the National Park Service's official nonprofit partner raising private funds to benefit Grand Canyon National Park, operating retail bookstores and visitor centers within the park, and providing premier educational opportunities about the natural and cultural history of the region.
Split into simpler sentences: The Grand Canyon Association is the National Park Service's official nonprofit partner raising private funds to benefit Grand Canyon National Park. The profits raised are used in operating retail bookstores, visitor centers within the park, and providing premier educational opportunities about the natural and cultural history of the region.