Complex sentence: Usually, the camp starts with an activity called the "Big Walk In"-a 6-10 hour tramp across the Kaimai Ranges and has a lot of exciting activities like orienteering, rock climbing and many more.
Split into simpler sentences: Usually, the camp starts with an activity called the "Big Walk In"-a 6-10 hour tramp across the Kaimai Ranges. During the course if the camp, there are a lot of exciting activities like orienteering, rock climbing and many more.