Complex sentence: In the early 1930s, The Sydney Bushwalkers and the Mountain Trails Club of New South Wales had a lease on seventy-five hectares of land in the area, and were probably responsible for the creation of some of the early tracks and camp sites.
Split into simpler sentences: In the early 1930s, The Sydney Bushwalkers and the Mountain Trails Club of New South Wales had a lease on seventy-five hectares of land in the area. They may have been responsible for the creation of some of the early tracks and camp sites.