AT&T Breaks Up Turner, Bulks Up Warner Bros. in Major WarnerMedia Overhaul

Significant layoffs expected as HBO and Turner Entertainment combine and Warner Bros. integrates Turner’s animation business

AT&T Inc. officially started reorganizing its WarnerMedia unit Monday by combining its disparate networks and entertainment businesses, an overhaul that is expected to lead to significant layoffs.

The company said it hired former NBC Entertainment Chairman Robert Greenblatt to be chairman of a newly created unit called WarnerEntertainment and Direct-to-Consumer. In that role, Mr. Greenblatt will lead a new “networks” unit composed of HBO and Turner’s entertainment unit, as well as oversee content on the direct-to-consumer...