Complex sentence: Due to this presence is that the Colombian department of Antioquia has been considered a major route of the Basque-Navarre immigration, mainly during the colonial era, when hundreds of Basque migrated to be linked to the Spanish colonization companies.
Split into simpler sentences: Due to this presence, the Colombian department of Antioquia has been considered a major point of Basque-Navarre immigration. This occurred mainly during the colonial era, when hundreds of Basques migrated to be linked to the Spanish colonization companies.