Simplify the following text for a Grade 10 native English-speaking person.
Original: Simultaneously , Archer starred in a production of his courtroom play The Accused , staged at London 's Theatre Royal Haymarket . The play concerned the court trial of an alleged murderer and assigned the role of jury to the audience , which would vote on the guilt of Archer 's character at the end of each performance .
Simplified: The play was staged at London 's Theatre Royal Haymarket and concerns the court trial of an alleged murderer from beginning to end .