The facts from which it arises, which are addressed by whatever institution may be involved

Al parecer el sujeto es "El ordenamiento jurídico".

"Institución": no me queda tan claro lo que pudiera ser... CONTEXTO.

Pero en fin, aporto lo posible.

As far as I can see, "la institución de que se trate" (which I would suggest translating as "the institution in question") is the subject of both "nace" and "va dirigida", so this sentence is referring to two things: the factual basis (I suggest this for "el plano fáctico") from which the institution arises (or originates) and the person or persons for which is it intended or designed ("a quien va dirigida"). I think one of these words would be more suitable than "addressed" here.

I have suggested "from what factual basis the institution arises", rather than "the factual basis from which the institution arises", because I think the latter would be confusing: it would produce the sentence "the factual basis from which it arises and for whom it is intended", and this tends to suggest that "the factual basis" is the antecedent of "for whom", which of course is not the case.

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Note added at 2 hrs (2012-04-13 20:14:03 GMT)
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Two more points. My reading of this assumes that "quien" should really have an accent: "quién". The omission of this accent is not very unusual; it could be a mistake or just a typo.

Second, I read "quien" as referring to a person or persons. I find it very strange that my colleagues are interpreting it as "el plano fáctico a quien va dirigida...", as if "quien" were a relative pronoun and "el plano fáctico" were its antecedent. This usage would have been fairly normal in Spanish up to the seventeenth century, but it is extremely unusual nowadays; "quien" must have a personal antecedent:

"quien. 1. Pronombre relativo, que, por ser palabra átona, debe escribirse sin tilde a diferencia del pronombre interrogativo o exclamativo quién (→ quién). Su plural es quienes. Equivale a el que, la que, y hoy se emplea siempre referido a personas o a entes personificados, nunca a cosas."
http://buscon.rae.es/dpdI/SrvltConsulta?lema=quien

much of the same really

A few options with "factual circumstances" and "factual context" (trying to get the ending "which it is designed/intended to address" to fit):

1. the factual circumstances behind the establishment/creation of the institution in question and which it is designed/intended to address
2. the factual circumstances based on which the institution in question is created/established and which it is intended/designed to address
3. the factual context for the creation/establishment of the institution in question and which it is intended/designed to address.
4. the factual basis/context for, and targets/objectives of, the institution in question




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Note added at 2 days2 hrs (2012-04-15 20:44:45 GMT)
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Looking at this again, I suppose it's stretching things to try to make that "a quién" refer to the "plano fáctico".

Assuming that the 'quien' indeed refers to a 'quien', then this might be:
the factual basis for the creation of the institution, and who it intends to serve (or "and who it is intended to serve")