Simplify the following text for a Grade 8 native English-speaking person.
Original: There must have been a naval battle somewhere near the mouth of the Nile , as shortly afterwards many Sherden are seen in the Pharaoh 's body-guard where they are conspicuous by their horned helmets with a ball projecting from the middle , their round shields and the great Naue II swords with which they are depicted in inscriptions of the Battle of Kadesh .
Simplified: Shortly afterwards Sherden are seen in the Pharaoh 's body-guard with their horned helmets , round shields and the great Naue II swords .