Complex sentence: Nezak coins with the bull's crown appear well into the 8th century, at which time it appears that a confederacy emerges between the Nezaks and the Alchons, possibly against Turkic invaders.
Split into simpler sentences: Nezak coins with the bull's crown appear well into the 8th century. At which time it appears that a confederacy emerges between the Nezaks and the Alchons, possibly against Turkic invaders.