Complex sentence: The Dominican Republic has gained a reputation of being a major destination for international sex tourism, although it is mostly concentrated in the poorest coastal towns of the country, namely Las Terrenas, Cabarete, Sosua, and Boca Chica.
Split into simpler sentences: The Dominican Republic has gained a reputation of being a major destination for international sex tourism. Sex tourism is mostly concentrated in the poorest coastal towns of the country, namely Las Terrenas, Cabarete, Sosua, and Boca Chica.