Complex sentence: Then the lens was focused and the subject framed and the picture was taken, the photographer flipped a switch and pulled the large tab in the back of the camera to pull the negative over the positive, through some rollers to spread the developing agent.
Split into simpler sentences: Then the lens was focused and the subject framed and the picture was taken. The photographer flipped a switch and pulled the large tab in the back of the camera to pull the negative over the positive, through some rollers to spread the developing agent.