Complex sentence: Her youngest child was born in 1971, during Billy McMahon's term as Prime Minister, and the family continued to reside in the Sydney suburb of Bellevue Hill, except when Sonia was required to be in Canberra for official duties.
Split into simpler sentences: Her youngest child was born in 1971, during Billy McMahon's term as Prime Minister. During this term, the family continued to reside in the Sydney suburb of Bellevue Hill, except when Sonia was required to be in Canberra for official duties.