Complex sentence: Based in Sydney, Simpson is considered the mother of Australian modernism: when returning as an art student from France in 1913, she brought back a series of reproductions of then-current works which proved extremely influential to the movement.
Split into simpler sentences: Based in Sydney, Simpson is often considered the mother of Australian modernism. While returning from France in 1913, she brought back a series of reproductions of then-current works which proved extremely influential to the movement.