Complex sentence: In 1999, after the opening of King Fahd International Airport, all scheduled flights were shifted out of Dhahran and the airport now serves as the King Abdulaziz Air Base of the Royal Saudi Air Force.
Split into simpler sentences: In 1999, after the opening of the King Fahd International Airport, all scheduled flights were shifted out of Dhahran International Airport. It now serves as the King Abdulaziz Air Base of the Royal Saudi Air Force.