Quick, SUPER SHORTHAND rundown.
Originally there were Trolls
Trolls like kicking out the weak
A runty tribe of trolls called the dark trolls were evicted.
They found the well of eternity.
Skip forward a few thousands years you’ve got elves.
Some Elves like magic, and are naturally gifted. They’re the Highborne
Some Elves don’t like magic and aren’t naturally gifted. They become slaves, Lowborn
Eventually the Lowborn revolt and leave to do their Own thing.
The Highborne accidently summon the demons through the Well of eternity.
The Lowborne rise up to stop the demons.
The Lowborne stay at the well afterwards and protect it, as their ancestral homeland. They become the Night Elves.
The Highborne All leave to different places. Some go to Surumar, Some get sunk under the ocean (including the queen)
And some find the sunwell on the Ilse of Quel’danas. They make a Dynasty. and they dont mess with most people
Eventually Arthas destroys their home
They Change their names to honor everyone that died. To “Children of Blood” in their own words. Sin’dorei.
They are, once again. Still High Elves. Because they are Magically gifted elves that come from the Highborne bloodline