Simplify the following text for a Grade 4 native English-speaking person.
Original: Gunther leads in a downcast BrÃ 1\/4 nnhilde , who is astonished to see Siegfried .
Simplified: Gunther is to marry BrÃ 1\/4 nnhilde and Siegfried is to marry Gutrune . BrÃ 1\/4 nnhilde can not understand why Siegfried is doing this .