Complex sentence: She made her play stage debut in 1898 in "Bröllopet på Ulvåsa" at the Svenska teatern, she after that worked at that and other theaters owned by Alberts Ranft until 1915.
Split into simpler sentences: She made her play stage debut in 1898 in "Bröllopet på Ulvåsa" at the Svenska Teatern. Later on she worked in that venue and other theaters owned by Alberts Ranft until 1915.