Simplify the following text for a Grade 9 native English-speaking person.
Original: One Yolngu prehistoric stone arrangement at Maccasans Beach near Yirrkala shows the layout of the Macassan praus used for trepang ( sea cucumber ) fishing in the area .
Simplified: One Yolngu stone arrangement , at Maccasans Beach near Yirrkala , shows the layout of the Macassan praus ( ships ) used for Trepang fishing .