The package is deprecated in favour of This Prettier Plugin which uses ASTs to manipulate LaTeX, and is overall way better than this extension written for perfunctory.
A very simple and minimal extension that fits
To run the command, press Ctrl+Alt+Shift+B chord to Ctrl+Alt+Shift+L.
Alternatively, open the command palette and run LaTeX: Break Lines.
It is recommended to run formatter after breaking lines e.g. LaTeX Indent.
Nah, it's way too simple to bother writing a detailed README etc... Just try it out.