What is that book/conlang?
The book is A View from the Year 3000
, listing the 100 most influential people in history as someone in A.D. 3000 would rank them.
It was written by Michael H. Hart, a man who wrote a book several years earlier that ranked the 100 most important people in history. This is what he speculated the list would look like a thousand years later. He presents it as written by Arturo Kukeni, a descendant of himself living in the year 3000.
SAGE is a kind of auxlang/knowledge representation language that allows machines to translate perfectly from one language to another.
Unfortunately, it's been so long since I read the book that I no longer remember what "SAGE" stands for.