Complex sentence: Over the course of the route the line rises from an altitude of 278 metres in Freiburg to 885 metres in Hinterzarten, the second half of the route has a 5.5% upward gradient, making the Hell Valley line one of the steepest railway lines in Germany.
Split into simpler sentences: Over the course of the route the line rises from an altitude of 278 metres in Freiburg to 885 metres in Hinterzarten. The second half of the route has a 5.5% upward gradient, making the Hell Valley line one of the steepest railway lines in Germany.