Complex sentence: On 1 September, a Fokker F-27 from Braathens SAFE was used to calibrate the runways; on board were pilots from SAS and Aeroflot to learn about the landing conditions.
Split into simpler sentences: On 1 September, a Fokker F-27 from Braathens SAFE was used to calibrate the runways. On board were pilots from SAS and Aeroflot to learn about the landing conditions.