Simplify the following text for a Grade 6 native English-speaking person.
Original: His mother was Oane-no-kimi , a daughter of Soga no Iname , who was the chief , or Å - omi , of the Soga clan .
Simplified: His mother was Oane-no-kimi , a daughter of Soga no Iname , who was the chief of the Soga clan .