Complex sentence: The format was taken from the British series entitled "Britain's Brainiest Kid", and was publicised through Australian primary schools, with children sitting an online test, followed by a selection of them taking a supervised written test.
Split into simpler sentences: The format was taken from the British series entitled "Britain's Brainiest Kid". It was publicised through Australian primary schools, with children sitting an online test, followed by a selection of them taking a supervised written test.