Complex sentence: EnergyAustralia is a large Australian electricity supplier and retailer, previously owned by the Government of New South Wales, and primarily focussed on supplying the Sydney, Newcastle and Central Coast areas of New South Wales.
Split into simpler sentences: EnergyAustralia is a large Australian electricity supplier and retailer. A state government enterprise of the Government of New South Wales, it is primarily focussed on supplying the Sydney, Newcastle and Central Coast areas of New South Wales.