Complex sentence: At a gun shop he purchased four further carbine magazines, six additional boxes of ammunition, and a can of gun cleaning solvent, and at Sears he purchased a Sears Model 60 12 gauge semi-automatic shotgun before returning home.
Split into simpler sentences: At a gun shop he purchased four more carbine magazines, six additional boxes of ammunition, and a can of gun cleaning solvent. At Sears he purchased a Sears Model 60 12 gauge semi-automatic shotgun before returning home.