Complex sentence: The period of time required for the earth to make one complete revolution around the sun, measured from one vernal equinox to the next and equal to 365 days, 5 hours, 48 minutes, 45.51 seconds.
Split into simpler sentences: The period of time required for the earth to make one complete revolution around the sun, measured from one vernal equinox to the next. It is equal to 365 days, 5 hours, 48 minutes, and 45.51 seconds.