Complex sentence: Arabella Duval Huntington (1850? -1924) was the second wife of American railway tycoon Collis P. Huntington, and once known as the richest woman in America.
Split into simpler sentences: Arabella Duval Huntington (1850? -1924) was the second wife of American railway tycoon Collis P. Huntington. In her time, Arabella Huntington was known as the richest woman in America.