Simplify the following text for a Grade 10 native English-speaking person.
Original: Dostoevsky 's notebooks show that he was inspired to use the figure of the Grand Inquisitor after he encountered it in a play by Friedrich Schiller , Don Carlos ( 1785 â `` 1787 ) .
Simplified: Dostoevsky 's notebooks show that he had the idea of The Grand Inquisitor after he saw it in a play by Friedrich Schiller , Don Carlos ( 1785-1787 ) .