if the sun is behind me, the reflections in the lenses of the light signals can be so strong that it is impossible to determine which one is showing.
(the sun; is; behind me) (the reflections in the lenses of the light signals; can be; so strong that it is impossible to determine which one is showing)
the sun the reflections in the lenses of the light signals
is can be
behind me
so strong that it is impossible to determine which one is showing