Simplify the following text for a Grade 12 native English-speaking person.
Original: In 1747 , the Sultan Mahmud I had this dagger made for Nadir Shah of Persia , but the Shah was assassinated in connection with a revolt before the emissary had left the Ottoman Empire 's boundaries and so the Sultan retained it .
Simplified: In 1747 , the Sultan had this dagger made for Nadir Shah of Persia , but the Shah was assassinated before the emissary had left the Ottoman Empire 's boundaries and so the Sultan retained it .