Complex sentence: Along with being able to use a standard percussion cap, the Sharps had a fairly unusual primer feed, device which held a stack of pelleted primers that flipped one over the nipple every time the trigger was pulled and the hammer fell.
Split into simpler sentences: Along with being able to use a standard percussion cap, the Sharps had a fairly unusual pellet primer feed. This was a device which held a stack of pelleted primers that flipped one over the nipple every time the trigger was pulled and the hammer fell.