Complex sentence: Earles and her sisters retired from acting in films in 1930, but started working for the Ringling Brothers Circus and Barnum and Bailey Circus where they acted as "parade performers" in "side shows for 30 seasons".
Split into simpler sentences: Earles and her sisters retired from acting in films in 1930. But they started working for the Ringling Brothers Circus and Barnum and Bailey Circus where they acted as "parade performers" in "side shows for 30 seasons".