Complex sentence: All of Clay's interviews had the same background, two "i" sculptures, except for one interview, where he speculated that Mark was the Mole, had a digitally edited background that was changed to four "i"'s.
Split into simpler sentences: All of Clay's interviews had the same background, two "i" sculptures, except for one interview, where he speculated that Mark was the Mole. This interview had a digitally edited background that was changed to four "i"'s.