Complex sentence: New Ishigaki Airport was constructed by government of Okinawa Prefecture at a cost of 45.1 trillion yen and is now owned and operated by the City of Ishigaki.
Split into simpler sentences: New Ishigaki Airport was construction by government of Okinawa Prefecture at a cost of 45.1 trillion yen. After the completion of construction, the airport is now owned and operated by the City of Ishigaki.