Complex sentence: La Jalca was the first Spanish foundation of the region; therefore, the first head office of the current city of Chachapoyas was established there.There in 1538, he took the name of Saint John of the Border of the Chachapoyas, in honor to his holy boss.
Split into simpler sentences: La Jalca was the first Spanish foundation of the region; therefore, there there was established the first head office of the current city of Chachapoyas. In that one then (1538) took the name of Saint John of the Border of the Chachapoyas, in honor to his holy boss.