Complex sentence: Angers, France; and Cairo, Egypt, Giannou went on to begin a surgical career which has taken him to many of the contemporary world's most mediatized conflict zones, including Afghanistan, Chechnya, Iraq, Lebanon, Liberia and Somalia.
Split into simpler sentences: Angers, France; and Cairo, Egypt, Giannou went on to begin his career as a surgeon in conflict zones. Giannou's work has taken him to many of the contemporary world's most mediatized conflict zones, including Afghanistan, Chechnya, Iraq, Lebanon, Liberia and Somalia.