Corrected sentence: Autumn rains make mushrooms pop up around the forest.
What was wrong? There was a tiny spacing mistake: "pop up" and "around" were joined together. Put a space: "pop up around."
Why this sentence is good:
- "Autumn rains" tells when it happens.
- "make" tells that the rains cause something.
- "mushrooms pop up" tells what happens (mushrooms appear).
- "around the forest" tells where they appear.
Other simple ways to say it:
- In autumn, the rain makes mushrooms pop up all around the forest.
- After autumn rains, mushrooms appear all around the forest.
Nice sentence — just add the missing space and you're done!