I am currently struggling with wrapping my head around こと and how it
nominalises adjectives/sentences with adjectives to turn them into noun
phrases.

With verbs, it's easy:

> べんとうを食べる (I eat bento/I will eat bento)  
>  べんとうを食べること ((the act of) eating bento)

However, with adjectives (and particularly nouns) I'm not quite understanding
the transformation, other than the fact that the phrase now functions as a
noun/noun phrase and can be moved around the sentence.

> スイスがきれいだ (Switzerland is beautiful)  
>  スイスがきれいなこと ((as for the fact that?) Switzerland is beautiful... or (on the
> notion that???) Switzerland is beautiful).

This sentence was taken from: スイスがきれいなことは写真で知っています。

To me, the nominalised adjective/noun phrase does not _sound_ like a noun,
merely a statement that Switzerland is beautiful.

Any helpers? If I'm not clear I'm happy to try and elaborate further.
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question
adjectives nominalization na-adjectives particle-こと
How to translate nominalised adjectives from Japanese to English (e.g. スイスがきれいなこと)
The important thing to mention here, I feel, is that these will not be true
nouns, but noun phrases (as you have already noted in your post). It
translates more closely to 'Switzerland's being beautiful' or 'The fact that
Switzerland is beautiful', rather than simply 'Switzerland's beauty'.

If you truly want to change an adjective into a noun you can add さ (and remove
final い for i-adjectives). Switzerland's beauty would be スイスのうつくしさ or
スイスのきれいさ.

For na-adjectives, just add な and の or こと to nominalize it.

> スイスがきれいなこと は 写真で知っています。  
>  More literally: That Switzerland is beautiful is known from pictures.  
>  More colloquially: 'I know of Switzerland's beauty from pictures.'

Other noun phrases using na-adjectives:

> 好きなのは読書｛どくしょ｝です。/ 好きなことは読書{どくしょ｝です。[The thing I like] is reading.  
>  賑｛にぎ｝やかなことは大好きだ。I love gaiety.

Here's a link that might be helpful: <https://www.wasabi-jpn.com/japanese-
grammar/nominalizers-koto-and-no/>
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answer
There are several ways to translate "adjective + こと":

  1. Add "being" before the adjective, [optionally with a possessive noun to show its subject](https://www.btb.termiumplus.gc.ca/tpv2guides/guides/wrtps/index-eng.html?lang=eng&lettr=indx_catlog_p&page=90SDm90b7Xlw.html). This is probably the most literal choice, but this way of showing a subject may sound stilted in English. 

>     * 美しいこと  
>  being beautiful
>     * 彼女が美しいこと  
>  her being beautiful
>     * 彼女が美しいことは皆に知られている。  
>  Her being beautiful is known to everyone.
>     * 健康なこと  
>  being healthy

  2. Simply use the noun version of the adjective, such as "beauty", "friendliness" and "wealth". These nouns mean either "the degree of ～" and "the fact that ～" depending on the context. But practically speaking, this approach works in most cases. 

>     * 美しいこと  
>  (one's) beauty
>     * 彼女が美しいこと  
>  her beauty
>     * 彼女が美しいことは皆に知られている。  
>  Her beauty is known to everyone.
>     * 健康なこと  
>  (one's) health

  3. Use `the fact that + (clause)`. This is the most verbose choice, but it works. 

>     * 美しいこと  
>  the fact that someone is beautiful
>     * 彼女が美しいことは皆に知られている。  
>  The fact that she is beautiful is known to everyone.
>     * 健康なこと  
>  the fact that someone is healthy
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answer