Complex sentence: Radiocarbon dating samples show that construction of the structures started in the 6th century AD and occupied until the Early Colonial period (1532-1570), however through the pre-Columbian, conquest and colonial periods we have only the four brief references to Kuelap.
Split into simpler sentences: Radiocarbon dating samples show that construction of the structures started in the 6th century AD and occupied until the Early Colonial period (1532-1570). However, through the pre-Columbian, conquest and colonial periods we have only four brief references to Kuelap.