Complex sentence: The story is set in an Alternate Earth world where humans (dubbed "Blazers") have supernatural powers, these "Blazers" can materialize weapons known as "Device" which are made through a person's soul.
Split into simpler sentences: The story is set in an Alternate Earth world where humans (dubbed "Blazers") have supernatural powers. These "Blazers" can materialize weapons known as "Device" which are made through a person's soul.