Original sentence: Operation and maintenance costs are particularly important  because they represent a large portion of costs for nuclear power.The burden is clearly greater for nuclear producers than for coal producers, because investment costs are higher for nuclear plants, which also have the same or higher operating costs.To be competative in the current market, both the nuclear and coal industries must reduce new plant investment costs and construction time
Edited sentence: Both the nuclear and coal industries must reduce new plant investment costs and construction time.Operation and maintenance costs are particularly important simply because they are a large portion of nuclear operating costs.The burden is clearly greater for nuclear producers than for coal producers, because investment costs are higher for nuclear plants, which have no visible advantage in operating costs over coal plants.The burden of operating costs for nuclear power plants is also greater