Complex sentence: This rock formation is particularly prominent in southeastern Utah, where it forms the main attractions of a number of national parks and monuments including Zion National Park, Capitol Reef National Park, the San Rafael Swell, and Canyonlands National Park.
Split into simpler sentences: This rock formation is particularly prominent in southeastern Utah, where it forms the main attractions of a number of national parks and monuments. These include Zion National Park, Capitol Reef National Park, and Canyonlands National Park.