Simplify the following text for a Grade 8 native English-speaking person.
Original: Cusco ( in English , often spelled Cuzco ; in Quechua written Qusqu and pronounced ) is a city in southeastern Peru , near the Urubamba Valley of the Andes mountain range .
Simplified: Cusco is a city in southeastern Peru , near the Huatanay Valley ( Sacred Valley ) in the Andes mountain range .