Complex sentence: Bart confronts Homer and Marge about the ad, who tells him that its revenue made a lot of money, but Homer had ended up spending it all on incriminating photos he was being blackmailed for.
Split into simpler sentences: Bart confronts Homer and Marge about the ad, who tells him that its revenue made a lot of money. However, Homer had ended up spending it all to by back incriminating photos he was being blackmailed for.