I find nothing particularly incomprehensible about laws in general. In an experiment where you ask a bunch of amateurs to write legal documents I'm not sure you can apply any real interpretation to those results.

They use the example of DUI laws. Here's two. There's nothing particularly complicated about them, and the "center embedding," to the extent it is present, is entirely comprehensible.

https://leginfo.legislature.ca.gov/faces/codes_displaySectio...

https://www.revisor.mn.gov/statutes/cite/169a.20

Particularly clear both to the layman and to officers of the court.