Complex sentence: Moore led the posse directly to the ranch headquarters in American Valley and they next day they looked for Gilmore's cowboys, ending the day at a line cabin about from Grossetete's and Elsinger's homes.
Split into simpler sentences: Moore led the posse directly to the ranch headquarters in American Valley and they next day they hunted for Gilmore's cowboys. They spend the night at a line cabin about from Grossetete and Elsinger's homes.