Simplify the following text for a Grade 9 native English-speaking person.
Original: Cusick 's first leading roles at the Citizens ' Theatre were Dorian Gray in The Picture of Dorian Gray with Rupert Everett , Hamlet in The Marovitz Hamlet with Helen Baxendale , and Horner in The Country Wife .
Simplified: Cusick began his career as a classical theater actor . His first leading roles on stage included : Dorian Gray in The Picture of Dorian Gray with Rupert Everett , Hamlet in The Marovitz Hamlet with Helen Baxendale , and Horner in The Country Wife .