Complex sentence: The current Sharjah Airport was built in the 1970s and was opened on 1 January 1977, replacing an airport closer to the city that had been opened in 1932 for use by Imperial Airways and which was subsequently used by the RAF until 14 December 1971.
Split into simpler sentences: The current Sharjah Airport was built in the 1970s and was opened on 1 January 1977. It replaced RAF Sharjah which was closer to the city and had been opened in 1932 for use by Imperial Airways, and which was subsequently used by the RAF until 14 December 1971.