This precipitation fell mostly as rain in the southern half of the state, but in the northern half it started as rain and then changed to snow.
(This precipitation; fell mostly; as rain in the southern half of the state) (it; started; as rain; T:in the northern half) (it; changed; to snow; L:in the northern half; T:then)
This precipitation it it
fell mostly started changed
as rain in the southern half of the state
as rain T:in the northern half
to snow L:in the northern half T:then