Simplify the following text for a Grade 6 native English-speaking person.
Original: They refer to themselves as the Hlai people , but they are sometimes colloquially known as `` Sai '' or `` Say '' , and during the Sui Dynasty they were known by the name Liliao .
Simplified: The Hlai were known to the Sui Dynasty Chinese by the name Liliao . Presently they refer to themselves as the Hlai or Sai people .