Complex sentence: As of 2013, El Salvador had a population of approximately 6.29 million, making it the most densely populated country in the region composed predominantly by Mestizos of European and Indigenous American descent.
Split into simpler sentences: As of 2013, El Salvador had a population of approximately 6.29 million, making it the most densely populated country in the region. Its population consists largely of Mestizos of European and Indigenous American descent.