Complex sentence: The character is one of Batman's most enduring enemies and belongs to the collective of adversaries that make up Batman's rogues gallery, though given his high status as a supervillain, he has also come into conflict with Superman and other superheroes in the DC Universe.
Split into simpler sentences: The character is one of Batman's most enduring enemies and belongs to the collective of adversaries that make up Batman's rogues gallery. Given Ra's al Ghul's high status as a supervillain, he also comes into conflict with other superheroes in the DC Universe.