Simplify the following text for a Grade 5 native English-speaking person.
Original: He tells Siegfried that fear is an essential craft ; Siegfried is eager to learn it , and Mime promises to teach him by bringing him to Fafner the dragon . Since Mime was unable to forge Nothung , Siegfried decides to do it himself .
Simplified: Siegfried tells Mime to forge ( make ) the sword so that he can kill the dragon .