التَّشْوِيقُ إِلَى الْمُتَأَخِّرِ
Making the audience eager to hear a delayed element.
An opening that points to something strange without immediately naming it makes the listener want the rest of the sentence. The unusual nature of the first expression creates anticipation for the later identification.
For example, beginning with “The thing whose nature left people bewildered ...” naturally prompts the question “What thing?” The eventual answer receives greater attention. Length by itself is not the point; the created expectation is.