Simplify the following text for a Grade 8 native English-speaking person.
Original: Today it is generally recognized that Hatshepsut assumed the position of pharaoh and the length of her reign usually is given as twenty-two years , since she was assigned a reign of twenty-one years and nine months by the third-century BC historian , Manetho , who had access to many records that now are lost .
Simplified: Today it is generally recognized that Hatshepsut assumed the position of Pharaoh . The length of her reign usually is given as twenty-two years , since she was assigned a reign of twenty-one years and nine months by the third-century B.C. historian , Manetho , who had access to many records that now are lost .