The iris and the pupil are the diaphragm controlling the amount of light entering the eye.
(The iris and the pupil; are; the diaphragm controlling the amount of light) (the diaphragm; controlling; the amount of light) (light; entering; the eye)
The iris and the pupil the diaphragm light
are controlling entering
the diaphragm controlling the amount of light
the amount of light
the eye