Complex sentence: Many of the physical gags were lifted from the 1929 film Spite Marriage by Buster Keaton who had an uncredited role in writing gags for some of Skelton's early films.
Split into simpler sentences: Many of the physical gags were lifted from the Buster Keaton film "Spite Marriage" (1929). Keaton had an uncredited role in writing gags for some of Skelton's early films.