Check out AEScripts + the developer’s official page for the free “Un-Precompose” script. (Note: Always verify the source to avoid malicious files.)
Un-Precompose is an essential utility script for After Effects users who work with templates, client files, or complex character rigs. It allows you to explode any precomposition back into editable layers without manually copying and pasting.
No credit card. No trials. Just pure timeline freedom.