Complex sentence: In 1998 Father Bellucci left the magazine that he had led for 22 years and in 1999, after Father Giustino Béthaz's brief stint as editor-in-chief, he was succeeded by Father Bartolomeo Sorge, former editor of both Civiltà Cattolica and Aggiornamenti Sociali.
Split into simpler sentences: In 1998 Father Bellucci left the magazine that he had led for 22 years and in 1999. After Father Giustino Béthaz's brief stint as editor-in-chief, he was succeeded by Father Bartolomeo Sorge, former editor of both Civiltà Cattolica and Aggiornamenti Sociali.