Complex sentence: The station was built in 1924 and served as the terminus for the private Gråkallbanen, who until 1966 were not allowed to let on or off people along the tram line they shared with the city owned Trondheim Sporvei.
Split into simpler sentences: The station was built in 1924 and first served as the terminus for the private Gråkallbanen. Until 1966, passengers were not allowed on or off along the tram line they shared with the city owned Trondheim Sporvei.