Complex sentence: He served in Southern Africa until 6 November 1984, when he was appointed Apostolic Pro-Nuncio to the Netherlands, where he served until in 1988 he was appointed Substitute of the Secretariat of State in the Roman Curia.
Split into simpler sentences: He served in Southern Africa until 6 November 1984, when he was appointed Apostolic Pro-Nuncio to the Netherlands, where he served until 1988. In 1988 he was appointed Substitute of the Secretariat of State in the Roman Curia.