Complex sentence: Entirely run on rough and slippery and twisting asphalt mountain roads around the town of Ajaccio, the course runs mainly on roads that have mountain walls on one side and steep mountain drops on the other.
Split into simpler sentences: Entirely run on rough and slippery and twisting asphalt mountain roads around the town of Ajaccio. The roads run mainly on roads that have mountain walls on one side and steep mountain drops on the other.