Complex sentence: Ferdon proposed that it was inspired by a Quetzalcoatl cult whose ideas were brought to the region by "pochteca" traders, and the influence can also be seen in the site's tower kiva.
Split into simpler sentences: Ferdon proposed that it was inspired by a Quetzalcoatl cult whose ideas were brought to the region by "pochteca" traders. In his opinion the influence can also be seen in the site's tower kiva.