Complex sentence: East of Atlantis lay the ancient continent of Thuria, divided among several civilized kingdoms, including Commoria, Grondar, Kamelia, Thule, and Verulia.
Split into simpler sentences: East of Atlantis lay the ancient continent of Thuria, divided among several civilized kingdoms. Including among others Commoria, Grondar, Kamelia, Thule, and Verulia.