-(well, there's a reason the ascension of Earth-than-was would be sparked by the _H. sapiens_ line of hominids some millions of years later, rather than by the Plain Speech species 9792 and 9794.)
+(well, there's a reason the ascension of Earth-that-was would be sparked by the _H. sapiens_ line of hominids some millions of years later, rather than by the Plain Speech species 9792 and 9794.)