Complex sentence: In the first few months of 2008 Frontier was expected to begin another arrival and departure time, adding to total of three arrivals/departures by Frontier and five arrivals/departures by Northwest Airlines daily.
Split into simpler sentences: In the first few months of 2008 Frontier is expected to begin another arrival and departure time. Adding to total of three arrivals/departures by Frontier and five arrivals/departures by Northwest Airlines daily.