That's not a relative (adjective) clause; it's a that-clause—a noun clause (warning: grammar terms vary). It functions as a noun does in its various roles: subject, object, complement, appositive, etc.
This that is a conjunction, not a relative pronoun.
See Merriam-Webster at that conjunction
English and Language Usage's "resident" authority, linguist John ...
James once asked the cat, “Have you seen another person like me?”
The cat crossed his legs and thought for a while, then replied, “I’ve scratched lots of trees, but I’ve never seen a boy like you.”
The above would follow the rule you cited. No addition period is needed after the question mark closing the first quote.
Additionally, it follows the rule ...
There is a general rule in English that bitransitive verbs like give, send, offer, promise, sell, lend, show, tell can have two different syntaxes.
I gave the book to John
I gave John the book.
I am going to tell some news to you
I am going to tell you some news.
However, your chosen verb, "present" does not do ...
This starts with a finite clause, not a relative clause.
Aarts, in English Syntax & Argumentation - 1997 2001, states:
...[What] are the particular forms that Subjects can assume? ...
[T]hey are typically Noun Phrases .... However, Subjects can also be
realised by other phrase types [ ... and clauses].
5.2 Realisations of the Subject
"Contents sold by weight not volume."
has several words missing. This is not unusual on packaging and in places where there is not a lot of space.
The full version is
"The contents of this pack are sold [by the manufacturer] by weight not by volume."
It is therefore a passive.
Do I understand correctly that the meaning of "only" for "not until" is only valid for past actions:
You will only be able to put the roof on after you have built the walls.
= You will not be able to put the roof on until you have built the walls.
The issue here is that the word "to" can be used in a couple of different ways.
The usual way to form the infinitive of a verb is to put the particle "to" in front of it -- but that's not you want to do here (even though I just did it 3 times!).
I want to design a poster. <-- not your situation
A key unlocks a particular lock, and you can use "for" ...
Sleeping is not out of the question:
Do not wake the sleeping.
Sleeping is an example of—in traditional grammar terms—a nominalized adjective or an adjectival noun. It's an adjective—in this case a present participle adjective—functioning as a noun:
. . . an adjective that has undergone nominalization, and is thus used
as a noun. In the rich and the ...
[S [NP That [S a ruined structure found at Aqaba, Jordan, was probably a church]] [VP is indicated [PP [PP by its eastward orientation and overall plan], as well as [PP by the artifacts, such as glass oil-lamp fragments, found at the site.]]] ]
According to the Cambridge Grammar of the English Language, the clause starting with That... is a content clause, where that is an obligatory expandable declarative subordinator (p. 952)::
[That a ruined structure found at Aqaba, Jordan, was probably a church] is indicated...
The bracketed elements: [That a ruined structure at Aqaba, Jordan, was probably ...