Complex sentence: Norwegian soldiers are known to have been competing in Nordic skiing since the 19th century, the first major competition in Nordic combined was held in 1892 in Oslo at the first Holmenkollen Ski Festival, an event still held annually.
Split into simpler sentences: Norwegian soldiers are known to have been competing in Nordic skiing since the 19th century. The first major competition in Nordic combined was held in 1892 in Oslo at the first Holmenkollen Ski Festival, an event still held annually.