Complex sentence: Operating as a concessionaire of the National Park Service, the company operated from a base in Cedar City, Utah; the company's bus tours connected with Union Pacific trains there and offered a loop tour of the region's parks and monuments.
Split into simpler sentences: Operating as a concessionaire of the National Park Service, the company operated from a base in Cedar City, Utah. The company's bus tours connected with Union Pacific trains there and offered a loop tour of the region's parks and monuments.