Complex sentence: From 1980 to 1986, an estimated 21,000 people left Hong Kong permanently each year, and from 1987 the numbers rose sharply to 48,000 people a year Manion, Melanie.
Split into simpler sentences: From 1980 to 1986, an estimated 21,000 people left Hong Kong permanently each year. Beginning in 1987 the numbers rose sharply to 48,000 people a year Manion, Melanie.