Complex sentence: Currently, the farthest mainline service by an aircraft is a Boeing 737 by Southwest Airlines daily flight to Las Vegas, previously this aircraft and airline serviced the longest domestic route from the airport to Phoenix, Arizona.
Split into simpler sentences: Currently, the farthest mainline service by an aircraft is a Boeing 737 by Southwest Airlines daily flight to Las Vegas. Previously this aircraft and airline serviced the longest domestic route from the airport to Phoenix, Arizona.