Complex sentence: Only 2 million Australians were able to complete the census before the system was closed and the Australian Signals Directorate was assisting the ABS to bring the infrastructure back online more than 24 hours after the closure.
Split into simpler sentences: Only 2 million Australians were able to complete the census before the system was closed. The Australian Signals Directorate was assisting the ABS to bring the infrastructure back online more than 24 hours after the closure.