Complex sentence: The 1996 census recorded 157 speakers that number increased to 232 by 2006, rigor of the data collection by the Australian Bureau of Statistics census data has been challenged with speakers believed to considerably higher.
Split into simpler sentences: The 1996 census recorded 157 speakers; that number increased to 232 by 2006. The rigour of the data collection by the Australian Bureau of Statistics census data has been challenged, with speakers believed to considerably higher.