Complex sentence: In an average year Israel has about 1.7 billion cubic meters of conventional freshwater and brackish water hiin the North of the country and only 20% in the South.
Split into simpler sentences: In an average year Israel has about 1.7 billion cubic meters of conventional freshwater and brackish water resources at its disposal. About 80% of the water resources are located in the North of the country and only 20% in the South.