Complex sentence: The cathedral forms the highest point of the city, rising from the foot of the "Rocher Corneille", and contains architecture of every period from the 5th century to the 15th, which gives it an individual appearance.
Split into simpler sentences: The cathedral forms the highest point of the city, rising from the foot of the "Rocher Corneille". Constructed over centuries, it contains architecture of every period from the 5th century to the 15th, which gives it an individual appearance.