It is this tilt combined with the motion of the Earth around the Sun that causes more or less light to fall on one hemisphere or the other during each of the seasons.
(It; is; this tilt combined with the motion of the Earth around the Sun) (this tilt; combined; with the motion of the Earth around the Sun) (the motion of the Earth around the Sun; causes; more or less light to fall on one hemisphere or the other during each of the seasons)
It this tilt the motion of the Earth around the Sun
is combined causes
this tilt combined with the motion of the Earth around the Sun
with the motion of the Earth around the Sun
more or less light to fall on one hemisphere or the other during each of the seasons