Complex sentence: At one time, Allegiant also offered service to Las Vegas, Phoenix, and Fort Lauderdale from the airport; the Las Vegas and Phoenix services were discontinued due to fuel costs and the Fort Lauderdale service was eliminated due to congestion problems at Fort Lauderdale International Airport.
Split into simpler sentences: At one time, Allegiant also offered service to Las Vegas, Phoenix, and Fort Lauderdale from the airport. The Fort Lauderdale service was eliminated due to congestion problems at Fort Lauderdale International Airport.