Complex sentence: Junior is quickly forced to make excuses when Catherine drops by with a tray of manicotti and suggests they go out, but finally admits that he cannot leave the house under the terms of his house arrest.
Split into simpler sentences: Junior is quickly forced to make excuses when Catherine drops by with a tray of manicotti and suggests they go out. Junior then tells her the reason he cannot leave the house is because of the terms of his house arrest.