Complex sentence: In the 7th century, Dala Hill, a hill in Kano, was the site of a group of a community that engaged in iron-working; it is unknown whether these were Hausa people or speakers of Niger-Congo languages.
Split into simpler sentences: In the 7th century, Dala Hill, a hill in Kano, was the site of a community that engaged in iron-working. It is unknown whether these were Hausa people or speakers of Niger-Congo languages.