Breakdown of Diese Höhle ist umso interessanter, als sie völlig unberührt ist.
sein
to be
sie
she
dieser
this / that (fem.: diese, neut.: dieses)
die Höhle
the cave
umso
the (alternative second part)
interessant
interesting
völlig
completely
als
as (in 'insofern ... als')
unberührt
untouched
Questions & Answers about Diese Höhle ist umso interessanter, als sie völlig unberührt ist.
What exactly does umso ... als mean in this sentence, and why not just use weil?
umso [comparative], als translates to "all the more [adjective] because". It is a proportional-causal structure that shows the reason (being untouched) directly increases the degree of the adjective (interesting). You could say umso interessanter, weil..., but using als is a more elegant, higher-level way to tie the cause directly to the comparison.
Could I use je ... desto here instead of umso ... als?
Not quite! je ... desto (the ..., the ...) links two comparative changes (like "the older it is, the more interesting it is"). umso ... als is used when you have a static fact causing an increased state: it is "all the more interesting" simply because of the fact that it is completely untouched.
Why is the verb ist at the very end of the second half of the sentence?
In this specific structure, als functions as a subordinating conjunction. Just like weil or dass, it acts as a "verb kicker" and sends the conjugated verb (ist) to the end of its clause.
Why is the pronoun sie used to mean "it" here?
In German, personal pronouns must match the grammatical gender of the noun they refer back to. Because "cave" is feminine (die Höhle), you must use the feminine pronoun sie, even though we naturally translate it as "it" in English.
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