Complex sentence: In the anime, it is revealed that years ago she ventured into the Angel World and falls in love with an angel in first sight, who later became another angel's husband in which they both unknowingly banished Reine Devila out of the Angel World.
Split into simpler sentences: In the anime, it is revealed that years ago she ventured into the Angel World and fell in love with an angel at first sight, who later became another angel's husband. With that event, they both unknowingly banished Reine Devila out of the Angel World.