Original: In dry grasslands, you’ll find few trees and few mountains. There is very little shelter, and all you can hear is the grass rustle and the wind whistle.
Corrected (natural): In dry grasslands you will find few trees and few hills or mountains. There is very little shelter, and all you can hear is the rustle of the grass and the whistle of the wind.
Simpler (for a 6-year-old): Dry grasslands have very few trees and few hills. There is little shelter. All you can hear is the grass rustling and the wind whistling.
Why these changes?
- "few mountains" → "few hills or mountains": Grasslands are usually flat, so saying "hills or mountains" sounds clearer. "Hills" is simpler for a child to picture.
- "you'll" → "you will": "You will" is slightly more formal and clearer for learners, but "you'll" is also okay in speech.
- "the grass rustle" and "the wind whistle" → "the rustle of the grass" and "the whistle of the wind" or "grass rustling" and "wind whistling": These forms sound more natural in English. We often say the "sound of" something (the rustle of the grass) or use the -ing form to describe ongoing sounds (grass rustling).
If you want the sentence even shorter and easier, use the "Simpler" version above.