an option

I think this sounds less awkward, but it's a change from the original.

One has learned...

I prefer shown to taught for this.

when they refer to ...

By beginning the sentence with the Indirect Object "A uno le ..." the writer wishes to stress that he has personally been on the receiving end of this learning process (in English it seems more positive to refer to having "learnt" something rather than tho more clumsy "been taught") and the English translation should really reflect this nuance by taking the impersonal "one" as the subject. This would also seem to accurately express the slightly cynical use in Spanish of "A uno le" when refering to the French, as in the following sentence he reverts to the more coloquial "yo" form,