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I know that one of them is an adverb and one of them is an adjective.
But what is the more deeper meaning of the sentences? Can you create a proper context for them please?
Do also similar examples exist in other languages, like Latin, German and so on?
When you use "sana", it describes a property of "mia onklo", i.e. it expresses that the uncle was healthy while he came. If you use "sane", it describes "venas", i.e. you are saying that the action of his coming was healthy, which doesn't make any sense.
Here is a sentence where both forms make sense:
Some people use "sole" when "sola" should be used (I myself did it for many years), but I think that this deviation from the norm cannot be recommended.
In general the adverb (-e) modifies the verb, so the sentence could be translated My uncle comes in a healthy way (eg walks without a limp).
The adjective (-a) modifies the noun, so My uncle comes (and is) healthy.
It is a bit of a strange sentence without any further context, though.
