Complex sentence: Whalerock Industries was founded in January 2014 by Lloyd Braun, who served previously as the president of Brillstein-Grey, Entertainment, the chairman of the ABC Entertainment Group and the head of the Yahoo! Media Group.
Split into simpler sentences: Whalerock Industries was founded in January 2014 by Lloyd Braun. Among other positions, Braun served previously as the chairman of ABC and the head of the Yahoo! Media Group.