The Federal Communications Commission paused its review of Sinclair Broadcast Group Inc.’s proposed purchase of Tribune Media Co. to give time for the companies to arrange for the sale of some TV stations to bring the $3.9 billion deal in line with broadcast ownership limits. Sinclair earlier told the FCC it was evaluating divestitures, and Michelle Carey, the agency’s media bureau chief, said in a letter that it was “appropriate” to pause the agency’s informal 180-day deadline as the government assesses the company’s proposals.