Complex sentence: Before his tenure at Telstra, Switkowski served as Chief Executive Officer of the telecommunications company Optus and the photographic equipment company Kodak (Australasia)-he also served as its Chairman and Managing Director from 1992-1996.
Split into simpler sentences: Before his tenure at Telstra, Switkowski served as Chief Executive Officer of the telecommunications company Optus and the photographic equipment company Kodak (Australasia). He also served as Chairman and Managing Director of Kodak (Australasia) from 1992-1996.