Simplify the following text for a Grade 11 native English-speaking person.
Original: Late in the 3rd millennium BC , Nippur was conquered and occupied by the Semitic rulers of Akkad , or Agade , and numerous votive objects of Rimush , Sargon and Naram-Suen testify to the veneration in which they also held this sanctuary .
Simplified: Late in the 3rd millennium BC , Nippur was conquered and occupied by the Semitic rulers of Akkad , and their rulers , like Sargon , left gifts at this sanctuary .