Complex sentence: Southwest Airlines which then changed the name to TranStar but eventually shut down the TranStar operation in 1987 although Southwest continues to operate a large number of flights at the present time into New Orleans.
Split into simpler sentences: Southwest Airlines which then changed the name to TranStar. However, the TranStar operation was eventually shut down in 1987 although Southwest continues to operate a large number of flights at the present time into New Orleans.