The sentence you gave is: "The brain looks wrinkly and folded, like a walnut. Eating nuts can make your memory sharper, help you think faster and focus better."
This sentence is mostly correct, but to make it even clearer, we can add a small word for smoothness and fix slightly the style.
Here is the improved version: "The brain looks wrinkly and folded, like a walnut. Eating nuts can make your memory sharper, help you think faster, and help you focus better."
Explanation:
- We added "help you" before "focus better" to keep the sentence consistent and clear.
- We added commas after "faster" for proper list punctuation.
Your original sentence was very good – just a tiny improvement makes it clearer!