Drzewna kompozycja okazała się wielkim sukcesem.

From Lesson 497:Formal that (iż)·Polish

Questions & Answers about Drzewna kompozycja okazała się wielkim sukcesem.

Why is wielkim sukcesem in the Instrumental case here?
The verb okazać się (to turn out to be) acts as a linking verb when followed by a noun phrase, just like być (to be) and zostać (to become). Because of this, the noun phrase that follows it must take the Instrumental case, hence wielkim sukcesem instead of the Nominative wielki sukces.
How could we rewrite this sentence to use the formal word iż from this lesson?
To use iż, you have to change the sentence structure to include a subordinate clause, because iż means "that". You would say: Okazało się, iż drzewna kompozycja była wielkim sukcesem (It turned out that the woody composition was a huge success).
Why use drzewna instead of drewniana for "woody"?
Drzewny means "woody" in the sense of being related to trees or having the characteristics of wood, like a fragrance or a scent profile. In contrast, drewniany specifically means "wooden" or physically "made of wood", like a piece of furniture.
Could I use the imperfective verb okazywała się instead of okazała się?
You could, but it changes the meaning. The imperfective okazywała się would mean it "was turning out to be" or "repeatedly turned out to be" a success over time. The perfective okazała się used here shows a single, finalized conclusion that it was a success.

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