Complex sentence: It should be pointed out that not all illegal trips to Puerto Rico from the Dominican Republic end in tragedy: these trips are massively scheduled by traffickers, who sometimes travel up to three times each week from Puerto Rico to illegally bring Dominicans.
Split into simpler sentences: It should be pointed out that not all illegal trips to Puerto Rico from the Dominican Republic end in tragedy. These trips are massively scheduled by traffickers, who sometimes travel up to three times each week from Puerto Rico to illegally bring Dominicans.