Complex sentence: Karate Kid (Val Armorr) is a fictional character, a superhero in the future of the DC Comics universe, also a member of the Legion of Super-Heroes who is a master of every form of martial arts to have been developed by the 30th century.
Split into simpler sentences: Karate Kid (Val Armorr) is a fictional character, a superhero in the future of the DC Comics universe, and a member of the Legion of Super-Heroes. He is a master of every form of martial arts to have been developed by the 30th century.