Complex sentence: This name originally designed the primordial abyss, the water-dragon of darkness and chaos, comparable to Tiamat, and Rahab became later a particular demon, inhabitant of the sea, especially associated with the Red Sea, in this case sometimes associated with Leviathan.
Split into simpler sentences: This name originally designated the primordial abyss, the water-dragon of darkness and chaos, and so comparable to Tiamat. Rahab later became a particular demon, inhabitant of the sea, especially associated with the Red Sea, in this case sometimes associated with Leviathan.