Complex sentence: The Kootenai River and Lake Koocanusa cut a narrow fjord-like gorge between the Purcell Mountains and the Salish Mountains and is a popular route for visitors visiting the Kootenai National Forest.
Split into simpler sentences: The Kootenai River and Lake Koocanusa cut a narrow fjord-like gorge between the Purcell Mountains and the Salish Mountains. The byway is a popular route for visitors visiting the Kootenai National Forest.