Complex sentence: Lysaker served as the closest railway station to Oslo Airport, Fornebu until it closed in 1998; because of this the station was branded as Lysaker/Fornebu from May 27,1990 to October 7,1998.
Split into simpler sentences: Lysaker served as the closest railway station to Oslo Airport, Fornebu until it closed in 1998. Because of this the station was branded as Lysaker/Fornebu from May 27,1990 to October 7,1998.