Corrected sentences:
In dry grasslands, animals have to know how to run and hide in the tall grass. Burrows help animals stay warm in winter and cool in summer.
Why I changed things (easy steps):
- dry grasslands — I used the plural 'grasslands' because there are many grassland places, not just one.
- have to know how to run and hide — this is fine; it means animals must learn to run and hide in the tall grass.
- cool in summer — I used 'cool' instead of 'cool down' because it sounds a little simpler and shorter for kids.
- The rest of the sentence was already good: burrows help animals stay warm in winter and cool in summer.
If you want, I can make the sentences even shorter or turn them into a little story for you.