Simplify the following text for a Grade 10 native English-speaking person.
Original: Since his move to Orkney , Davies has often used Orcadian ( the adjective of â Orkneyâ ) or more generally Scottish themes in his music , and has sometimes set the words of Orcadian writer George Mackay Brown .
Simplified: Since his move to Orkney , Davies has often drawn on Orcadian or more generally Scottish themes in his music , and has sometimes set the words of Orcadian writer George Mackay Brown .