Complex sentence: There is a 479 km mostly paved road connection by the aforementioned highway 20 to Williams Lake, which features an 18% grade, narrow and dangerous switchbacks on the climb out of Bella Coola through the coastal mountains.
Split into simpler sentences: There is a 479 km mostly paved road connection by the aforementioned highway 20 to Williams Lake. The road features an 18% grade and narrow, winding switchbacks on the climb out of Bella Coola through the coastal mountains.