Complex sentence: In the fall of 1983, with the support of the local Bridger Bowl ski hill, the Eagle Mount ski program started with a plan to serve 20 to 30 people, teaching them either Alpine or Nordic skiing.
Split into simpler sentences: In the fall of 1983, with the support of the local Bridger Bowl ski hill, the Eagle Mount ski program began to take form. The idea was to start with a modest program of 20 to 30 people, teaching them either Alpine or Nordic skiing.