:s/^\([ a-zA-Z]\+\)\(\([\U4E00-\U9FA5]\+[^ ]*\)\+\)\([ a-zA-Z]\+\)\(\([\U4E00-\U9FA5]\+[^ ]*\)\+\)$/;\r;/g

There are two more brackets
PS: For Chinese matching, there is a method using [^ -x]¹ on the Internet. The test found that it works, but I don’t know the principle.
If there are no English or spaces in the Chinese explanation, you can write it more simply

\(\([\U4E00-\U9FA5]\+[^ ]*\)\+\)
#可以修改为：
\([^ a-zA-Z]\+\)\+

1. https://www.oschina.net/quest... ↩

You can add a map to map ; to ;<CR>

For example: inoremap ; ;<CR>