Complex sentence: In 2007, the church elected Bishop John Okoro, who was born in Nigeria and ordained as a priest in the Roman Catholic Church, but joined the Old Catholic Church of Austria in 1999.
Split into simpler sentences: In 2007, the church elected Bishop John Okoro. Bishop Okoro was born in Nigeria and was ordained as a priest in the Roman Catholic Church, but joined the Old Catholic Church of Austria in 1999.