Simplify the following text for a Grade 5 native English-speaking person.
Original: Khufu ( , in English ) , also known as Cheops ( ; , Kheops ) or , in Manetho , Suphis ( ; , Souphis ) , was a Pharaoh of Ancient Egypt 's Old Kingdom .
Simplified: Khufu was a Pharaoh ( or leader ) of Ancient Egypt 's Old Kingdom .