Complex sentence: Many believe that the power plant will help Namibia to overcome power shortage because up now Namibia imports most of its power from neighbouring South Africa but if they create a nuclear power plant Namibia will be able to produce enough power for the whole country.
Split into simpler sentences: Many believe that the power plant will help Namibia overcome power shortages, because Namibia imports most of its power from neighbouring South Africa. If they build a nuclear power plant, Namibia will be able to produce enough power for the whole country.