The changing yearly seasons are the result of the Earth's orbit around the Sun combined with its own rotation and the 23.5-degree tilt away from the perpendicular of that rotational axis.
(The changing yearly seasons; are; the result of the Earth's orbit around the Sun) (the Sun; combined; with its own rotation and the 23.5-degree tilt away from the perpendicular of that rotational axis)
The changing yearly seasons the Sun
are combined
the result of the Earth's orbit around the Sun
with its own rotation and the 23.5-degree tilt away from the perpendicular of that rotational axis