Simplify the following text for a Grade 5 native English-speaking person.
Original: It lies at an altitude of about 1,350 m ( 4,500 ft ) above sea level , in a warm , sheltered , fertile valley , surrounded by the hills of the Magaliesberg range .
Simplified: It is in a warm , well sheltered valley . The valley is surrounded by the hills of the Magaliesberg mountain range .