Complex sentence: A series of storms in the winter of 1983 caused four major road-closing slides between January and April, including a large slide near Pfeiffer Burns State Park which closed the road for more than a year.
Split into simpler sentences: A series of storms in the winter of 1983 caused four major road-closing slides between January and April. A major slide near Pfeiffer Burns State Park closed the road for more than a year.