Complex sentence: His banner paintings were displayed at the Chicago World's Fair of 1933, circuses such as Ringling Brothers, Barnum & Bailey, and Clyde Beatty, and were strung up at carnivals and travelling shows throughout the United States.
Split into simpler sentences: His banner paintings were displayed at the Chicago World's Fair of 1933, circuses such as Ringling Brothers, Barnum & Bailey, and Clyde Beatty. At the height of their popularity during the first half of the 20th century, sideshow banners were strung up at carnivals and travelling shows throughout the United States.