Complex sentence: Because of it, SI has now the inconsistency of a base unit with its name including a kilo prefix, and due to that many purists are unofficially dubbing again a kilogram with the original "grave" term.
Split into simpler sentences: Because of it, SI has now the inconsistency of a base unit with its name including a kilo prefix. But many purists are unofficially dubbing again a kilogram with the original "grave" term.