I read a Peter F Hamilton book years ago where the story we had been following stopped abruptly and we had a long section explaining the way an alien species developed, dominated its home planet and took to the stars. It was a fun, interesting part, but narratively it was very strange: the story came to a screeching halt while we caught up with what the baddies are up to. I can't remember the name of the book, and I can't be bothered digging it out because it's not like I really recommend reading it anyway...

Adrian Tchaikovsky's Children of Time feels like that concept, but executed significantly more cleverly. The story flits back and forth between the human story and the story of the other species. And the other species are made a lot more interesting and sympathetic than in the Hamilton book.

My one gripe with the book is that the characters are not particularly well fleshed out. It's a book very much focused on the grand story of the fate of humanity, rather than on the specific humans it follows, and so those humans are just plot devices, really.