Simplify the following text for a Grade 7 native English-speaking person.
Original: Since the late 1950s , the city has experienced significant immigration , firstly from southern Italy , then from other nationalities , the most notable being a large Chinese community which first arrived in the late 1980s .
Simplified: Since the late 1950s , the city has had a big amount of immigration , first from southern Italy , then other countries . Since the late 1980s a large Han community has settled in the city .