Complex sentence: Lalla Carlsen (née Haralda Petrea Christensen) (1889--1967) was a Norwegian singer and actress, and is regarded as one of the most legendary female revue artists in Norway.
Split into simpler sentences: Lalla Carlsen (née Haralda Petrea Christensen) (1889--1967) was a Norwegian singer and actress. She is regarded as one of the most legendary female revue artists in Norway.