Simplify the following text for a Grade 6 native English-speaking person.
Original: Lozi , also known as Silozi and Rozi , is a Bantu language ( of the Niger-Congo language family ) that is spoken by the Lozi people , primarily in southwestern Zambia and in surrounding countries .
Simplified: Lozi , also known as Silozi and Rozi , is a Bantu language of the Niger-Congo language family .