The sentence you wrote is: "Lionfish have thin, long fins on its back and belly that have stingy spines." Let's fix it so it's grammatically correct and easy to understand.
Here is the corrected sentence:
"Lionfish have thin, long fins on their backs and bellies that have stingy spines."
Explanation:
- "Lionfish" is plural, so we use "their" instead of "its".
- "Fins" is plural, and they are on plural body parts "backs" and "bellies".
- The rest of the sentence is good and easy to understand.