Simplify the following text for a Grade 9 native English-speaking person.
Original: The wild ancestors of Malus domestica are Malus sieversii , found growing wild in the mountains of Central Asia in southern Kazakhstan , Kyrgyzstan , Tajikistan , and Xinjiang , China , and possibly also Malus sylvestris .
Simplified: The wild ancestors of Malus domestica are Malus sieversii . They grow wild in the mountains of Central Asia in the south of Kazakhstan , Kyrgyzstan , Tajikistan , and Xinjiang , China , and possibly also Malus sylvestris .