Complex sentence: Harvey's mascot is Joker, a harlequin jack-in-the-box character, reminiscent of the mascot/logo for Paramount Pictures/Famous Studios' "Noveltoons" series of animated cartoons of the 1940s-1960s.
Split into simpler sentences: Harvey's mascot is Joker, a harlequin jack-in-the-box character. This is reminiscent of the mascot/logo for Paramount Pictures/Famous Studios' "Noveltoons" series of animated cartoons of the 1940s-1960s.