Complex sentence: In the fourth season of "Big Brother", the American reality TV show, which aired thirty-three episodes during the summer of 2003 from July 8 to September 24, the big twist for the year was "The X-Factor".
Split into simpler sentences: In the fourth season of "Big Brother", the American reality television show, aired thirty-three episodes during the summer of 2003 from July 8 to September 24. The big twist for the year was "The X-Factor".