Complex sentence: After returning to the United States, he joined Buffalo Bill's Wild West Show and the Barnum and Bailey's Circus, where he attracted much attention from Hollywood talent scouts looking to bring "authenticity" to their productions.
Split into simpler sentences: After returning to the United States, he joined Buffalo Bill's Wild West Show and the Barnum and Bailey's Circus. During his time working with Buffalo Bill's Wild West Show and Barnum and Bailey's Circus, Perley attracted much attention from Hollywood talent scouts looking to bring "authenticity" to their productions.