The illuminator has a semi- silvered mirror that reflects the light from the light source down through the objective.
(The illuminator; has; a semi- silvered mirror that reflects the light from the light source down through the objective) (a semi- silvered mirror; reflects; the light from the light source down)
The illuminator a semi- silvered mirror
has reflects
a semi- silvered mirror that reflects the light from the light source down through the objective
the light from the light source down