Simplify the following text for a Grade 10 native English-speaking person.
Original: Peeter Volkonski Peeter ( also Piotr Andreevich Volkonsky ) ( born December 9 , 1954 ) , in Tallinn , Estonia ) is a Estonian actor and rock-musician composer .
Simplified: Peeter Volkonski ( born 12 September 1954 in Tallinn ) is an Estonian actor , rock-musician , composer .