Complex sentence: From 2001 to 2007, he worked as editor of "il Giornale" after which he was succeeded by the journalist Mario Giordano when he became editor of Italian newsmagazine "Panorama".
Split into simpler sentences: From 2001 to 2007, he worked as editor of "il Giornale". He was succeeded by the journalist Mario Giordano when he became editor of Italian newsmagazine "Panorama".