Complex sentence: Caranqui was the northernmost area fully incorporated into the Inca Empire, although the Inca fortified Rumichaca Bridge further north on the present-day border of Ecuador and Colombia.
Split into simpler sentences: Caranqui was the northernmost area fully incorporated into the Inca Empire. North of the Caranqui, the Incas advanced to the Rumichaca Bridge on the border of Ecuador and Colombia.