Simplify the following text for a Grade 10 native English-speaking person.
Original: Archduke ( in German Erzherzog ) is a title distinct from Grand Duke ( in German GroÃ herzog ) , used in some other German royal houses and still in sovereign Luxembourg .
Simplified: Archduke ( Erzherzog ) is a title distinct from Grand Duke ( GroÃ herzog or GroÃ fÃ 1\/4 rst ) that is used in some other German royal houses and still in sovereign Luxemburg .