"Quite simple" is the same thing as "left as an exercise for the reader", i.e. when someone couldn't be bothered to do things right / didn't know how to do thin

"Quite simple" is the same thing as "left as an exercise for the reader", i.e. when someone couldn't be bothered to do things right / didn't know how to do things right, but made it work by shuffling and other kinds of rearrangements before it sorta worked. Maybe this language is simple to write if you know the rules. It won't be easy to read, ever, not even if this is the only language you have ever learned and practiced for decades.