Complex sentence: The way he pulled this technique off was by removing the lens cap of his camera to create a make believe photograph, Friths camera didn't have a shutter because the wet-plate process that was used at the time required an exposure of several seconds.
Split into simpler sentences: The way he pulled this technique off was by removing the lens cap of his camera to create a make believe photograph. Frith's camera didn't have a shutter because the wet-plate process that was used at the time required an exposure of several seconds.