Complex sentence: During World War II he served as an army chaplain and in parishes in Yugoslavia and Austria, and after he studied liturgy and canon law at the Pontifical Oriental Institute in Rome, receiving his doctorate from the Pontifical Gregorian University.
Split into simpler sentences: During World War II he served as an army chaplain and in parishes in Yugoslavia and Austria. Afterwards he studied liturgy and canon law at the Pontifical Oriental Institute in Rome, receiving his doctorate from the Pontifical Gregorian University.