Complex sentence: The largest sideshow was attached to the most prestigious circus, Ringling Brothers, Barnum and Bailey, known as the "big one", was a symbol of the peak of the practice and its acceptance in American society.
Split into simpler sentences: The largest sideshow was attached to the most prestigious circus, Ringling Brothers, Barnum and Bailey, known as the "big one". It was a symbol of the peak of the practice and its acceptance in American society.