Complex sentence: Although Isis is often cited as a DC creation, the series is one of the very few Filmation originals (most of their creations were adaptations of previously existing material); the character was created specifically for the television series and was only later adapted for comics.
Split into simpler sentences: Although Isis is often cited as a DC Comics creation, the series is one of the very few Filmation originals (most of their creations were adaptations of previously existing material). The character was created specifically for the television series and was only later adapted for comics.