Complex sentence: In 2005 Ryanair began daily flights from London Stansted, in subsequent years flights from Dublin Airport, the Stansted route flew 110,000 passengers within 15 months whilst Dublin only 21,000, the airline left the airport in October 2007.
Split into simpler sentences: In 2005 Ryanair began daily flights from London Stansted and in subsequent years flights from Dublin Airport. The Stansted route flew 110,000 passengers within 15 months whilst the Dublin route flew only 21,000, therefore the airline left the airport in October 2007.