Simplify the following text for a Grade 6 native English-speaking person.
Original: Die WalkÃ 1\/4 re ( The Valkyrie ) , WWV 86B , is the second of the four operas that form the cycle Der Ring des Nibelungen ( The Ring of the Nibelung ) , by Richard Wagner .
Simplified: It is the second of the four operas that together tell a story called Der Ring des Nibelungen ( The Ring of the Nibelung ) .