Complex sentence: The story of Clara Ward, who commonly used one or another version of the title "Princesse de Caraman-Chimay", is poorly known today, but for some years in the early 1890s she was the toast of the United States.
Split into simpler sentences: The story of Clara Ward, who commonly used one or another version of the title "Princesse de Caraman-Chimay", is poorly known today. For some years in the early 1890s she was the toast of the United States.