Complex sentence: The theory was revived by the American writer Robert Frazer, who argued in "The Silent Shakespeare" (1915) that the actor William Shakespeare merely commercialised the productions of more elevated authors, sometime adapting older works.
Split into simpler sentences: The theory was revived by the American writer Robert Frazer, who argued in "The Silent Shakespeare" (1915). Frazer argued that the actor William Shakespeare merely commercialised the productions of more elevated authors, sometime adapting older works.