Complex sentence: Alaska Airlines flies Boeing 737-400 and 737-800 jetliners while Delta Connection operated by SkyWest Airlines flies Canadair CRJ-700 regional jets into the airport.
Split into simpler sentences: Alaska Airlines flies Boeing 737-400 and 737-800 jetliners. Delta flies their flights under the Delta Connection banner and are operated by SkyWest Airlines who flies Canadair CRJ-700 regional jets into the airport.