Complex sentence: In June 2015, Austrian Airlines confirmed to purchase 17 Embraer 195s formerly owned by Lufthansa CityLine as a replacement for their ageing Fokker 70s and 100s.
Split into simpler sentences: In June 2015, Austrian Airlines announced the purchase of 17 Embraer 195s. These Embraer aircraft, which were formerly owned by Lufthansa CityLine, will replace the ageing Fokker 70s and 100s.