Complex sentence: America faced multiple depressions and fiscal turmoil in the early 20th century and the demand for affordable and fashionable women's clothing sparked designers and department stores to manufacture clothing in bulk quantities that were accessible to women of all classes and incomes.
Split into simpler sentences: America faced multiple depressions and fiscal turmoil in the early portion of the 20th Century. The ready-to-wear fashion sparked a large movement for designers and department stores to manufacture clothing in bulk quantities that could be accessible for women of all classes and incomes.