Complex sentence: In 1984, Lantz sold everything outright to MCA/Universal, though he remained active in overseeing how Universal handled his characters (for merchandise, TV, home video, theme parks, limited edition cels, etc.) up until his death in 1994.
Split into simpler sentences: In 1984, Lantz sold everything outright to MCA/Universal. Though Lantz did remain active in overseeing how Universal handled his characters (for merchandise, TV, home video, theme parks, limited edition cels, etc.) up until his death in 1994.