Complex sentence: Research Parkway and Challenger Parkway are both four lane roads with wide banking turns and long straight aways with no outside access roads, allowing for even modest vehicles to attain high speeds without the fear of sudden traffic.
Split into simpler sentences: Research Parkway and Challenger Parkway are both four lane roads with wide banking turns and long straightaways. These streets offer little outside road access, allowing for even modest vehicles to attain high speeds without the fear of sudden traffic.