Complex sentence: He then worked as a lawyer, Crown Prosecutor and acting judge before winning the first federal by-election in Australian history, as a Protectionist for the seat of Darling Downs, caused by the death of his father William Groom.
Split into simpler sentences: He then worked as a lawyer, Crown Prosecutor and acting judge. Groom won the first federal by-election in Australian history, as a Protectionist for the seat of Darling Downs, caused by the death of his father William Groom.