Complex sentence: There are 16th and 17th-century chronicles and references that support the idea of a banner, or flag, attributable to the Inca, but its origins are from symbols and mural designs found in several civilizations of the Andes with thousands of years of history.
Split into simpler sentences: There are 16th and 17th-century chronicles and references that support the idea of a banner attributable to the Inca. Also its origins are from symbols and mural designs found in several civilizations of the Andes with thousands of years of history.