Both the changes in the length of the day and the height of the Sun at noon are caused by the tilt of the Earth's spin axis with respect to the plane of the Earth's path around the Sun.
(Both the changes in the length of the day and the height of the Sun at noon; are caused; by the tilt of the Earth's spin axis with respect to the plane of the Earth's path around the Sun)
Both the changes in the length of the day and the height of the Sun at noon
are caused
by the tilt of the Earth's spin axis with respect to the plane of the Earth's path around the Sun