Complex sentence: For most of its length, it is a controlled access freeway (motorway) conforming to interstate standards that serves as a spur into Columbia from its northeastern suburbs and from intercity traffic traveling from I-77 and I-20.
Split into simpler sentences: For most of its length, it is a controlled access freeway (motorway) conforming to interstate standards. The highway serves as a spur into Columbia from its northeastern suburbs and from intercity traffic traveling from I-77 and I-20.