Simplify the following text for a Grade 8 native English-speaking person.
Original: The Duke of Roxburghe is the Premier Baronet of Scotland by his Baronetcy of Innes-Ker of Innes created in 1625 .
Simplified: The Duke of Roxburghe , who is also Baronet of Innes-Ker of Innes is the Premier Baronet of Scotland because the baronetcy is the oldest one still existing in Scotand . It was created in 1625 .