Complex sentence: A recurring plot element of many episodes hinges on a limitation resembling that of the Green Lantern of DC Comics, in that his pendant needs to be recharged periodically, but unlike the Green Lantern, Prince Planet cannot perform this task himself.
Split into simpler sentences: A recurring plot element of many episodes hinges on a limitation resembling that of the Green Lantern of DC Comics, in that his pendant needs to be recharged periodically. But unlike the Green Lantern, Prince Planet cannot perform this task himself.