Complex sentence: Jimmy Rolleri had brought his rifle and got off at the bottom of the hill, intending to hunt along the creek at the southern base of the hill and then meet the stage at the bottom of the western grade.
Split into simpler sentences: Jimmy Rolleri had brought his rifle and got off at the bottom of the hill. He intended to hunt along the creek at the southern base of the hill and then meet the stage at the bottom of the western grade.