Complex sentence: Her brother is Mark Higgie, an Australian former diplomat and intelligence analyst, who was the London liaison officer between the Australian Office of National Assessments and the Joint Intelligence Committee 2006-2009 who subsequently became international affairs adviser to Federal Opposition Leader Tony Abbott.
Split into simpler sentences: Her brother is Mark Higgie, an Australian former diplomat and intelligence analyst, who was the London liaison officer between the Australian Office of National Assessments and the Joint Intelligence Committee 2006-2009. Higgie subsequently became international affairs adviser to Federal Opposition Leader Tony Abbott.