Complex sentence: They found butchered remains in a barn behind the Nelson's cabin, seven miles northeast of Paden, Oklahoma, but when they entered the cabin to question the Nelsons, Laura picked up a Winchester rifle.
Split into simpler sentences: They found butchered remains in a barn behind the Nelsons' cabin, seven miles northeast of Paden, Oklahoma. When they entered the cabin to question the Nelsons, Laura picked up a Winchester rifle.