Complex sentence: It is revealed that Mr. Ratburn looks a lot like the Cheyenne that Sitting Bull he met while visiting town, leads the viewer to think that Mr. Ratburn's grandfather was the Cheyenne mentioned.
Split into simpler sentences: It is revealed that Mr. Ratburn looks a lot like the Cheyenne that Sitting Bull he met while visiting town. Which leads the viewer to think that Mr. Ratburn's grandfather was the Cheyenne mentioned.