Complex sentence: In 1907, several mushers based in Nome (Alaska) Nome Kennel Club, which promotes the breeding of dog teams and sponsors the race "All Alaska Sweepstakes" whose route goes from Nome to Candle and which is organized for the first time in 1908.
Split into simpler sentences: In 1907, several mushers based in Nome, Alaska, calling themselves the Nome Kennel Club, which promoted the breeding of dog teams and sponsored the All Alaska Sweepstakes race. The Sweepstakes, whose route goes from Nome to Candle, was organized for the first time in 1908.