Complex sentence: Some scenes in the film have a blurred effect around the borders of the frame, which were achieved by taking old wide-angle lenses and mounting them onto the front several cameras (Arri Macros in this case).
Split into simpler sentences: Some scenes in the film have a blurred effect around the borders of the frame. These were achieved by taking old wide-angle lenses and mounting them onto the front several cameras (Arri Macros in this case).