Simplify the following text for a Grade 11 native English-speaking person.
Original: Although archaeological evidence is scant , oral history has many references to people living in Hilo , along the Wailuku and Wailoa Rivers during the time of ancient Hawaii .
Simplified: Although there is not much archaeological evidence , people lived in the areas along Hilo Bay , Wailuku and Wailoa Rivers before the Western world made contact .