Complex sentence: Now alone, Stubby heads out and seeks revenge from Chaco, discovering him hiding with his two bandits in a barn, and that with Stubby's possessions in their cart realizes the sheriff of Slat Flats and Chaco were in cahoots the whole time.
Split into simpler sentences: Now alone, Stubby heads out and seeks revenge on Chaco, discovering him hiding with his two bandits in a barn with Stubby's possessions in their cart. He realizes the sheriff of Slat Flats and Chaco were in cahoots the whole time.