Complex sentence: Downtown Lillehammer and the axis between Lillehammer and Oslo were the most congested areas, and the Norwegian State Railways ran up to 22 trains per day between Oslo and Lillehammer, and all venues could be reached within walking distance from train stations.
Split into simpler sentences: Downtown Lillehammer and the axis between Lillehammer and Oslo were the most congested areas, and the Norwegian State Railways ran up to 22 trains per day between Oslo and Lillehammer. All venues could be reached within walking distance from train stations.