Complex sentence: Tower of Babel is a Justice League storyarc dealing with Batman's betrayal to the superhero community by secretly noting his allies' strengths and weaknesses for years, and these records was discovered by his enemy Ra's Al Ghul, who used them to defeat the League.
Split into simpler sentences: Tower of Babel is a Justice League storyarc dealing with Batman's betrayal to the superhero community by secretly noting his allies' strengths and weaknesses for years. These records was discovered by his enemy Ra's Al Ghul, who used them to defeat the League.