The secondary rainbow is caused by the same thing that causes the first rainbow, which is refraction of light through water droplets.
(The secondary rainbow; is caused; by the same thing) (the same thing; causes; the first rainbow, which is refraction of light through water droplets) (the first rainbow; is; refraction of light)
The secondary rainbow the same thing the first rainbow
is caused causes is
by the same thing
the first rainbow, which is refraction of light through water droplets
refraction of light