1
It consists in a long string of subordinate clauses and parenthetical phrases - but there is no main clause and no periods.
2
So, if the phrase is essential to the meaning of the sentence, it's attached to the main clause with that, and no comma.
3
It sounds like a proposition of Euclid with the main clauses omitted.
4
On the 12th the capitulation was drawn up, of which the main clauses were:
5
The hander declaration has three main clauses;
6
. And in this register the words were practically complete in themselves and didn't need an explanatory main clause to follow.