Complex sentence: It replaced RAF Sharjah which was closer to the city and had been opened in 1932 which was the first Airport in UAE and GCC, for use by Imperial Airways, and which was subsequently used by the RAF until 14 December 1971.
Split into simpler sentences: It replaced RAF Sharjah which was closer to the city and was opened in 1932. It was the first airport in UAE and GCC, for use by Imperial Airways, and was subsequently used by the RAF until 14 December 1971.