Complex sentence: SH-9 is a major highway around the Norman area, and at 350 miles (563.3 km), Oklahoma's second-longest state highway (being dwarfed only by State Highway 3).
Split into simpler sentences: SH-9 is a major highway around the Norman area. At 350 miles (563.3 km), SH-9 is Oklahoma's second-longest state highway (second to State Highway 3).