Complex sentence: Oujda has a strategic importance because of its location on the border.There are many economic and natural resources however, problems of overpopulation of the city and increase in unemployment rate up to 18% of the 11% on the national level.
Split into simpler sentences: Oujda has a strategic importance because of its location on the border. However, problems of overpopulation of the city and increase in unemployment rate up to 18% of the 11% on the national level.