Complex sentence: Steve Bartels served a time as President/CEO of Def Jam Recording till it was announced on August 3,2017, that Eminem's longtime manager and co-founder of Shady Records, Paul Rosenberg has been appointed the new President/CEO of Def Jam Recordings.
Split into simpler sentences: Steve Bartels served a time as President/CEO of Def Jam Recording. On August 3,2017, Eminem's longtime manager and co-founder of Shady Records, Paul Rosenberg was named as the new President/CEO of Def Jam Recordings.