Splitting a Git submodule into multiple smaller submodules helps organize large codebases and manage dependencies more granularly. As the creator of CoreUI with over 25 years of version control experience since 2000, I’ve restructured numerous projects where monolithic submodules needed division for better maintainability. The recommended approach uses git filter-branch or git subtree to extract subdirectories into new repositories, then replaces the original submodule with multiple smaller ones. This preserves commit history while improving project organization.