Adding an explanation before Genitivattribut

Question

I would like to know, that if one could add an explanation just before an Genitivattribut, if yes, how could it be achieved? Does my following attempt cause any misunderstandings?

Was ist die oben genannten Phase von - eine sehr bekannte Kreativitätsmethode - "Brainstorming"?

Edit: Actually I would like to add some extra information in my example that was "Brainstorming ist eine sehr bekannte Kreativitätsmethode" I've tried to translate my sentence to English, so that you can understand, what I try to convey.

What is the above-mentioned phase of "Brainstorming", which is a well-known creative method?

or

What is the above-mentioned phase of being a well-known creative method "Brainstorming"?

This could be with relative clause achieved but I would like to build a one line sentence with it.

And additionally, I've split my sentence into two parts, to make it clear

Was ist die oben genannten Phase von Brainstorming, Brainstorming ist eine sehr bekannte Kreativitätsmethode.

Answer 1

"Von" takes the dative, though it's sometimes substituted for the genetive. The natural way to add an extra attributive clause is after the expression in question, and separated by commas, with the same case as the expression.

For your example, with a real genitive:

Was ist die oben genannte Phase des "Brainstorming", einer sehr bekannten Kreativitätsmethode?

An alternative way is to use parenthesis:

Was ist die oben genannte Phase des "Brainstorming" (einer sehr bekannten Kreativitätsmethode)?

In this case, you can even insert it as an extra genitive attribute, so you have a chain of two genitive attributes:

Was ist die oben genannte Phase der sehr bekannten Kreativitätsmethode des Brainstormings?

This works because the expression "Methode des X" works.

The sentence looks still a bit odd, though, but we need context to phrase it more naturally. For starters, "die oben genannte" clashes with the use of the indefinite article and the presence of an additional explanation - if the text already mentioned brainstorming, it should have already talked about what brainstorming is, so it shouldn't be necessary to add this extra information in a question.