Simplify the following text for a Grade 10 native English-speaking person.
Original: Swahili people , or Waswahili , are an ethnic group living chiefly on the Swahili Coast of East Africa , mainly the coastal regions and the islands of Kenya and Tanzania , and north Mozambique .
Simplified: The Swahili are a people and culture found on the coast of East Africa , mainly the coastal regions and the islands of Kenya and Tanzania , and north Mozambique .