A night rainbow is a true rainbow caused by refraction off water drops with the light source behind you.
(A night rainbow; is; a true rainbow caused by refraction off water drops with the light source behind you) (a true rainbow; caused; by refraction off water drops with the light source behind you)
A night rainbow a true rainbow
is caused
a true rainbow caused by refraction off water drops with the light source behind you
by refraction off water drops with the light source behind you