Complex sentence: Thunderball (Eliot Franklin) is a Marvel Comics supervillain, a frequent enemy of Thor and a somewhat reluctant ally of the Wrecker and the Wrecking Crew.
Split into simpler sentences: Thunderball (Eliot Franklin) is a fictional character, a supervillain that appears in comic books published by Marvel Comics. He is a frequent enemy of Thor and a somewhat reluctant ally of the Wrecker and the Wrecking Crew.