Simplify the following text for a Grade 4 native English-speaking person.
Original: Finally , Beowulf tears Grendel 's arm from his body at the shoulder and Grendel runs to his home in the marshes to die .
Simplified: Beowulf tears Grendel 's arm off from his body and sticks it on the wall as a trophy . Grendel runs to his home in the marshes , where he dies .