Complex sentence: Depending on the films success, two more Tintin movies could be produced, the first of which would be directed by Jackson and be based on "The Seven Crystal Balls" and "Prisoners of the Sun".
Split into simpler sentences: Depending on the films success, two more Tintin movies could be produce. The first of film would be directed by Jackson and be based on "The Seven Crystal Balls" and "Prisoners of the Sun".