Complex sentence: Currently, eleven occupational layers have been unearthed in Sabi Abyad, levels from 11 to 7 are considered "pre-Halaf", from 6 to 4 transitional, and from 3 to 1 "early Halaf".
Split into simpler sentences: Currently, eleven occupational layers have been unearthed in Sabi Abyad. Levels from 11 to 7 are considered "pre-Halaf"; from 6 to 4, transitional; and from 3 to 1, "early Halaf".