Complex sentence: The terrain is mountainous, and the two-lane road is unpaved in spots, and travelers are cautioned to take their time and to remain alert while driving it: the route takes approximately one hour to drive because of these factors.
Split into simpler sentences: The terrain is mountainous, and the two-lane road is unpaved in spots, and travelers are cautioned to take their time and to remain alert while driving it. The route takes approximately one hour to drive because of these factors.