This story was originally published on Marketing Dive. To receive daily news and insights, subscribe to our free daily Marketing Dive newsletter. Omnicom on Monday provided a deeper look at how its leadership and agency structure are changing following the close of its $13 billion-plus acquisition of rival Interpublic Group last week, according to a press release. The ad-holding group, now the world’s largest, estimates it will eliminate another 4,000 jobs globally to realize its cost synergy targets, CEO ...