Audio By Vocalize Taifa Group Founder, Rostam Azizi, and Sultan Ali Allana, Director of the Aga Khan Fund sign transaction documents in Nairobi. [Courtesy] Tanzanian billionaire Rostam Azizi has vowed to protect the editorial independence of Nation Media Group (NMG) after his firm, Taarifa Ltd, acquired the Aga Khan Fund for Economic Development’s (AKFED) controlling stake in the regional media house. AKFED sold its entire stake in NPRT Holdings Africa Ltd, the investment vehicle holding a 54.08 percent interest in NMG, to Taarifa Ltd. “We are not going to compromise on the independence of our media company because of…