Complex sentence: The Wasatch Front is 120 miles (193 km) long and an average of 5 miles (8 km) wide due to it being constricted by natural barriers, never exceeding a width of approximately 15 miles (24 km).
Split into simpler sentences: The Wasatch Front is 120 miles (193 km) long and an average of 5 miles (8 km) wide. Variation in width is due to its being constricted by natural barriers but it never exceeds a width of approximately 15 miles (24 km).