Complex sentence: The fire prompted Mary to retire and she moved to Los Angeles, where she donated her husband's collection of negatives to the Smithsonian Institution in Washington, D.C. She died in 1925.
Split into simpler sentences: The fire prompted Mary to retire and she moved to Los Angeles. Before she died, she donated her husband's collection of images to the Smithsonian Institution in Washington, D.C. She died in 1925.