Complex sentence: Svalbard Airport, Longyear opened in 1975, allowing better facilities and connection with scheduled flights to the mainland, and Lufttransport established itself at Svalbard Airport.
Split into simpler sentences: Svalbard Airport, Longyear opened in 1975, allowing better facilities and connection with scheduled flights to the mainland. At the same tiem, Lufttransport established itself at Svalbard Airport.