Learn Turkish: Dünkü toplantıda, yeni kriterleri belirlemiş olan müdürü gördüm. - In yesterday's meeting, I saw the manager who has determined the new criteria.

While belirleyen can mean "who determines" or "who determined," using belirlemiş olan (verb + -mIş olan) explicitly frames the time. It emphasizes that the manager had already completed the action of determining the criteria before the meeting took place.

Why does kriterleri have the accusative -i ending if it is not the main object of the sentence?

Relative clauses act like mini-sentences. The verbal phrase belirlemiş olan comes from the transitive verb belirlemek (to determine). Since "the new criteria" is the specific direct object of that action, it still takes the accusative case (kriterleri).

I recognize dün as "yesterday", but why is it dünkü here?

The suffix -ki attaches to time words and locatives to turn them into adjectives. Because of vowel harmony with the rounded vowel in dün, it becomes -kü. It modifies toplantı to mean "yesterday's meeting" or "the meeting which was yesterday."

Both kriterleri and müdürü have the accusative case. Does a sentence often have two accusative objects?