Complex sentence: The race consisted of four laps of cross-country skiing, each lap a total of 7.5 km. Every 2.5 km there would be a shooting zone, the first one is prone and the second one is standing.
Split into simpler sentences: The race consisted of four laps of cross-country skiing, each lap a total of 7.5km. Every 2.5km there would be a shooting zone, the first one is prone and the second one is standing.