Simplify the following text for a Grade 8 native English-speaking person.
Original: The GukanshÅ records that Sujin ruled from the palace of Mizogaki-no-miya at Shiki in what will come to be known Yamato province .
Simplified: Jien records that KÅ an ruled from the palace of Mizogaki-no-miya at Shiki in what will come to be known as Yamato province .