Complex sentence: A proposed $4 million activated carbon filtration system by the water authority would be a temporary solution until a larger reverse osmosis treatment plant could be built, and there is concern among citizens over the cost and the lack of access to resources and the proposed solution.
Split into simpler sentences: A proposed $4 million activated carbon filtration system by the water authority would be a temporary solution until a larger reverse osmosis treatment plant could be built. In addition, citizens are also concern over the cost and the lack of access to resources and the proposed solution.