Complex sentence: In the UK, the label takes on the name "Def Jam UK" and is operated through Mercury Music Group, while in Japan, it is "Def Jam Japan" operating through Universal Sigma Music.
Split into simpler sentences: In the UK, the label takes on the name "Def Jam UK" and is operated through Mercury Music Group. While in Japan, it is "Def Jam Japan" operating through Universal Sigma Music.