The sidereal year, on the other hand, is the period of the Sun's revolution with respect to the stars, and it is equivalent to the period of Earth's orbital revolution.
(The sidereal year; is; the period of the Sun's revolution with respect to the stars) (it; is; equivalent to the period of Earth's orbital revolution)
The sidereal year it
is is
the period of the Sun's revolution with respect to the stars
equivalent to the period of Earth's orbital revolution