There HAS to be something missing here!!!--unless it's me.

That sentence lacks meaning, coherence, and sense -- entirely; whatever way you look at it! I'm completely jaded but I'll do my level best.

Let's start by splitting the sentence into 2:
a) "Aunque la interpretación de este diagrama puede ser compleja, no lo es tanto ----

b) "la determinación de qué expertos humanos presentan unas interpretaciones más similares a las del sistema inteligente."

In my humble opinion, what's missing (please don't ask me for grammatical terms)is a "dependiendo de"--or a "según"----that's the only way I can find to make any sense of it.

I've had countless similar experiences in my translation career --the writer leaving out essential elements (lousy secretary, flagrant carelessness, etc.) that give "meaning" to a sentence.

So Ailish, let's reconstruct the sentence---using my aforementioned suggestions:

"Aunque la interpretación de este diagrama puede ser compleja, no lo es tanto; (semicolon) según [or, dependiendo de] la determinación de qué expertos humanos presentan [here, I'm not sure if it should be "presenten"] unas interpretaciones más similares a las del sistema inteligente."

There should be a statute in Criminal Law prohibiting clients giving such badly written work to us poor translators.

Anyway, that's it, for me. I'm off to bed---until Sunday:-)))

Hope this helps somewhat.
terry
PD: "Up Tipp!!!"