Complex sentence: Since spring 2015, Eurowings is being redeveloped into a low-cost carrier for short-and long-haul flights and by October 2015 also started to incorporate Germanwings' route network as this brand will be integrated into Eurowings during 2016.
Split into simpler sentences: Since spring 2015, Eurowings itself is being redeveloped into a low-cost carrier for short-and long-haul flights. By October 2015, it also started to incorporate Germanwings' route network as this brand will be integrated into Eurowings during 2016.