Simplify the following text for a Grade 8 native English-speaking person.
Original: Jien records that KÅ rei was the eldest son of Emperor KÅ an , and that he ruled from the palace of Ihoto-no-miya at Kuroda in what will come to be known as Yamato province .
Simplified: The GukanshÅ records that KÅ rei ruled from the palace of Ihoto-no-miya at Kuroda in what will come to be known as Yamato province .