Complex sentence: Animators working at Warner Brothers used Acme punched paper shot on Acme animation stands drew on Acme disks (light tables), so that having products come from Acme in cartoons was an inside joke that any animator would recognize.
Split into simpler sentences: Animators working at Warner Brothers used Acme punched paper shot on Acme animation stands drew on Acme disks (light tables). So having products come from Acme in cartoons was an inside joke that any animator would recognize.