Complex sentence: He soon moved back to Sydney with his parents, where at the age of 19 he married Hilda Bredt, the 17-year-old daughter of prominent feminist and socialist Bertha Bredt.
Split into simpler sentences: He soon moved back to Sydney with his parents. At the age of 19 he married Hilda Bredt, the 17-year-old daughter of prominent feminist and socialist Bertha Bredt.