With CJ Cherryh's Foreigner novels, I haven't had that sort of good fortune. However, I think I'm beginning to have a clue to at least one of the aspects of that grammar. What she does, leading up over a number of pages to those sections that in other writers would be identified as infodumps, is carefully build the foundation for a question -- and then, when she writes that section, she answers that question. Which means that by that time the reader is so eager for the information that it doesn't come across as an infodump at all.
I wish I had a specific example to give you here, to make this more clear, and more rigorous. I don't have one yet, but as soon as I do, I'll post it.
