Probably the context will supply the needed information and the line may be set up correctly.

If there is no way of finding out what the sentence means, follow copy.

Insert no punctuation marks which you are not sure are needed.
Punctuation as we know it is of recent invention.

The practice of the art of printing brought the necessity for a defined and systematized use of the points which had, most of them, long been in existence, but which had been used largely according to the personal preferences of the scribes or copyists.

With the coming of the new methods of book reproduction came the recognized need for standardization and systematization.
The most ancient inscriptions and manuscripts are merely strings of letters, without spacing between words or sentences and without any points of any sort, like the example on page 1.
The first mark to be used was the dot, or period.