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