So a day on Venus, (the time it takes to rotate once on its axis) is the same as 243 days on Earth.
(the time; to rotate; T:once) (the time it takes to rotate once on its axis); is; the same as 243 days on Earth; T:a day on Venus)
the time the time it takes to rotate once on its axis)
to rotate is
T:once
the same as 243 days on Earth T:a day on Venus