Complex sentence: Aglargor died in the battle trying to gain back his land with his people, so the inhabitants of the Valley of Whispering Winds decided to start fresh and rename their land Videstaktet in remembrance of what Aglargor did.
Split into simpler sentences: Aglargor died in the battle trying to gain back his land with his people. Following his death the inhabitants of the Valley of Whispering Winds decided to start afresh and renamed their land Videstaktet, in remembrance of what Aglargor did.