As you head south in the state, the mixture of precipitation changed from a snow/sleet/rain mix to more of a sleet/rain mix.
(you; head; south in the state) (the mixture of precipitation; changed; from a snow/sleet/rain mix; to more of a sleet/rain mix)
you the mixture of precipitation
head changed
south in the state
from a snow/sleet/rain mix to more of a sleet/rain mix