Complex sentence: Burst or continuous high speed is a shooting mode in still cameras, most notably single-lens reflex cameras which allow several photographs to be captured in quick succession by either single pressing the shutter button or holding it down.
Split into simpler sentences: Burst or continuous high speed is a shooting mode in still cameras. In single-lens reflex cameras, it allows several photographs to be captured in quick succession by either pressing the shutter button or holding it down.