Zookeepers encouraged him to spend more time in the Monkey House…until one day they locked him inside.
This quote was taken from an article about an African man who, in 1906, was locked in a zoo as part of an ethnological exhibition. In editing an essay I wrote, my professor noted next to this quote "Anything about Adam's language in that sentence of interest?" (She mentioned in person that the author crafts sentences like this a lot).
I think because the author ended with "they locked him inside", it made for a sentence that hit on the emotional sensibilities of the reader, because you didn't really see that coming. But I don't know if there is a name for constructing sentences like this (my professor said there probably is but she doesn't specialize in composition and rhetoric so she wouldn't know).
The ellipsis I used in my essay to omit some of the writing. The original quote reads: Zookeepers encouraged him to spend more time in the Monkey House, where he had been sleeping since his arrival, until one day they locked him inside.