Complex sentence: In Egyptian mythology, Duat (or Tuat) (also called Akert, Amenthes or Neter-khertet) is the underworld, where the sun god Ra traveled from west to east during the night, and where he battled Apep.
Split into simpler sentences: In Egyptian mythology, Duat (or Tuat) (also called Akert, Amenthes, or Neter-khertet) is the underworld. This is the region through which the sun god Ra traveled from west to east during the night, and where he battled Apep.