Simplify the following text for a Grade 8 native English-speaking person.
Original: Meanwhile at Redwall Abbey , two stoats run off with the Sword of Martin the Warrior after accidentally killing Brother Hal with a bow and arrow lying out from a carnival the night before , and young Samkim , a mischievous squirrel , and his partner Arula the molemaid set off to claim back the sword .
Simplified: Meanwhile , two stoats at Redwall Abbey kill a Brother of Redwall and run away with the sword of Martin the Warrior .