Complex sentence: In 1941, he became editor of The Southern Cross, South Africa's national Catholic Newspaper, and held this post until 1948; he agaom became editor of The Southern Cross in 1986, this time for a five year period.
Split into simpler sentences: In 1941, he became editor of The Southern Cross, South Africa's national Catholic Newspaper. In 1986 he again became editor of The Southern Cross, this time for a five year period.