Simplify the following text for a Grade 8 native English-speaking person.
Original: In 2005 he appeared in Killer Bash about a tormented geek 's soul taking revenge on his murderer 's children by taking over a girl 's body .
Simplified: In 2005 he acted in Killer Bash about a murdered geek 's soul taking revenge on his murderer 's children by taking over a girl 's body .