Complex sentence: The American Women's League Chapter House was built in 1910 by a local contractor, from plans with Prairie School and Bungalow/Craftsman influences designed by St. Louis architects Helfensteller, Hirsch & Watson.
Split into simpler sentences: The American Women's League Chapter House was built in 1910. It was designed in Prairie School and Bungalow/Craftsman style by St. Louis architects Helfensteller, Hirsch & Watson.