Complex sentence: Roger Peyrefitte (August 17,1907--November 5,2000) was a French diplomat and writer who in his novels often treated controversial themes and whose work put him at odds with the Roman Catholic church.
Split into simpler sentences: Roger Peyrefitte (August 17,1907--November 5,2000) was a French diplomat and writer. In his novels, he often treated controversial themes and his work put him at odds with the Roman Catholic church.