Complex sentence: It is sometimes considered to be Dutch in ancestry, due to Eduard Korthals being Dutch, but is sometimes considered to be a German breed because Korthals kennel, Ipenwoud, was located in Biebesheim am Rhein, Germany.
Split into simpler sentences: It is sometimes considered to be Dutch in ancestry, due to the breed founder, Eduard Korthals, nationality. Others consider the Griffon to be a German breed because Korthals kennel, Ipenwoud, was located in Biebesheim am Rhein, Germany.