Complex sentence: In addition to work inside the passenger terminal, the airport is planning a rental car facility, new parking facilities, a new 5,000 foot (to be extended to in a later phase) runway, and a new GA apron.
Split into simpler sentences: In addition to work inside the passenger terminal, the airport is building a rental car facility, new parking facilities. It is also planning a new 5,000 foot (to be extended to in a later phase) runway, and a new GA apron.