Complex sentence: The airport provides flights to Multan, Lahore, Karachi, Islamabad and because of high demand is operating flights to and from Dubai since 2008 making it an international airport.
Split into simpler sentences: The airport provides flights to Multan, Lahore, Karachi, Islamabad. Because of high demand, it has been operating flights to and from Dubai since 2008, making it an international airport.