Questions & Answers about Ik heb nog nooit een dergelijk artefact gezien.
Why is it dergelijk without an -e at the end?
Even though dergelijk functions as a determiner meaning "such a", it follows normal adjective spelling rules. Because artefact is a neuter word (het artefact) and is preceded by the indefinite article een, it gets no -e ending. If it were a de-word like situatie, it would be een dergelijke situatie.
Could I say zo'n artefact instead of een dergelijk artefact?
Yes, they mean the same thing. Zo'n is much more common in everyday spoken Dutch. Dergelijk is a bit more formal and is often preferred in writing or professional contexts.
Why use nog nooit instead of just nooit?
While nooit means "never", combining it with nog specifically means "never up until now" or "never before". It emphasizes that this is the very first time you are seeing an artifact like this.
Why is the past participle gezien placed at the very end of the sentence?
In a Dutch main clause, the conjugated verb (heb) takes the second position, but all other verbs in the same clause, like the past participle gezien, get pushed to the very end of the sentence.