Complex sentence: It followed a 40.5 km route around Lake Annecy, on a course that was mainly flat, with a 270 m hill of 5% gradient approximately ¾ around the course which would assist strong climbers in finishing closer to the TT specialists.
Split into simpler sentences: It followed a 40.5 km route around Lake Annecy, on a course that was mainly flat. A 270 m hill approximately ¾ around the course of 5% gradient would assist strong climbers in finishing closer to the TT specialists.