I am working on a school project about extinction events. I found the following on Wikipedia:
The rebound of life's diversity with the sustained re-flooding of continental shelves at the onset of the Silurian saw increased biodiversity within the surviving orders.
What's the subject of "saw"? Is it "The rebound"? And if so, how can rebound - the return into sth normal, see something?
Also, isn't using sustained and re-flooding in the same sentence pleonasm?
I did not intend to be sarcastic or anything, I'm genuinely curious about all of this.