Complex sentence: Since 1991, she has headed the archaeological mission from the Louvre Museum at Saqqara on the "North of the Unas Causeway" under the Supreme Council of Antiquities.
Split into simpler sentences: Since 1991, she has headed the archaeological mission from the Louvre Museum at Saqqara. She has worked on the "North of the Unas Causeway" under the Supreme Council of Antiquities.