Complex sentence: John D. Zeglis (born May 2,1947) served as the President of AT&T and the Chairman and Chief Executive Officer (CEO) of AT&T Wireless.
Split into simpler sentences: John D. Zeglis (born May 2,1947) is an American business executive. He has served as the president of AT&T and the chairman and chief executive officer (CEO) of AT&T Wireless.