Complex sentence: Frances Isabelle (Lockwood) Brundage (1854--1937) was an American illustrator best known for her depictions of enchanting Victorian children on postcards, valentines, calendars, and other ephemera principally published by Raphael Tuck & Sons, Samuel Gabriel Company, and Saalfield Publishing.
Split into simpler sentences: Frances Isabelle (Lockwood) Brundage (1854--1937) was an American artist and illustrator. Her work typically features children, most notably on postcards, valentines, and other ephemera published by Raphael Tuck & Sons, Samuel Gabriel Company, and Saalfield Publishing.