Complex sentence: He's most famous for having portrayed the title character in the movies Bør Børson, Bør Børson II, and the tv-series Fleksnes Fataliteter-the most popular Scandinavian sitcom in history with fans in Sweden, Denmark and Norway.
Split into simpler sentences: He's most famous for having portrayed the title character in the movies Bør Børson, Bør Børson II, and the tv-series Fleksnes Fataliteter. "Fleksnes" is by far the most popular Scandinavian sitcom in history with a huge number of fans in both Sweden, Denmark and Norway.