Complex sentence: Four names have been retired, Iwa of 1982, Iniki of 1992, Paka of 1997 and Ioke of 2006 they were replaced by Io (which was later changed to Iona), Iolana, Pama and Iopa respectively.
Split into simpler sentences: Four names have been retired, Iwa of 1982, Iniki of 1992, Paka of 1997 and Ioke of 2006. They were replaced by Io (which was later changed to Iona), Iolana, Pama and Iopa respectively.