Complex sentence: Delta Air Lines is the dominant carrier at the airport via its Delta Connection service operated by SkyWest and was flown by Embraer EMB-120 "Brasilia" turboprop aircraft until January 2014 when this service was replaced with Canadair CRJ-700 regional jet flights.
Split into simpler sentences: Delta Air Lines is the dominant carrier at the airport via its Delta Connection service operated by SkyWest with Embraer EMB-120 "Brasilia" turboprop aircraft. In January 2014 this Delta Connection service was enhanced with Canadair CRJ-700 regional jet flights.