Simplify the following text for a Grade 5 native English-speaking person.
Original: Richard Wagner composed some operas , featuring Valkyries ( German : WalkÃ 1\/4 ren , singular : WalkÃ 1\/4 re ) . These operas are Die WalkÃ 1\/4 re , Siegfried , and GÃ tterdÃ mmerung .
Simplified: In poetry , valkyries appear in `` Die WalkÃ 1\/4 ren '' by H. Heine ( appearing in Romanzero , 1847 ) , `` Die WalkÃ 1\/4 ren '' ( 1864 ) by H. v. Linge , `` SkÃ ldmon '' ( appearing in GÃ mda Land , 1904 ) .