It's natural for us to break up the passing of time into days--the increment of time it takes for the earth to make one rotation.
(us; to break up; the passing of time into days) (the increment of time; takes; for the earth to make one rotation) (the earth; to make; one rotation)
us the increment of time the earth
to break up takes to make
the passing of time into days
for the earth to make one rotation
one rotation