Complex sentence: Many years later the idea set down in this story was used in one of the many episodes of the TV series "Pokemon", in which the owner of a lighthouse uses the horn and a recording to call a Dragonite to his tower.
Split into simpler sentences: Many years later the idea set down in this story was used in one of the many episodes of the T.V series Pokemon. In which the owner of a lighthouse uses the horn and a recording to call a Dragonite to his tower.