Complex sentence: The majority of African immigrants in Hong Kong are businessmen, who sell mobile phones and electronic devices with shops mostly concentrated in Chungking Mansions on Nathan Road in Kowloon's Tsim Sha Tsui district.
Split into simpler sentences: The majority of African immigrants in Hong Kong are businessmen, who sell mobile phones and electronic devices. They are concentrated in Chungking Mansions on Nathan Road in Kowloon's Tsim Sha Tsui district.