Your original sentence is mostly clear but can be enhanced for better readability and flow. Here's a revised version:
"Draw a neuron on a button. Its parts will not be labeled, as this information is too advanced for the targeted age group. The neuron can be illustrated as a fun character and used elsewhere on the page to fill empty spaces or add to the scene."
Changes made:
- Replaced "signed" with "labeled" for clarity.
- Added "group" after "targeted age" for specificity.
- Improved flow by adjusting phrasing.
This version is grammatically correct and clear for your intended purpose.