Simplify the following text for a Grade 9 native English-speaking person.
Original: Partly from fear of losing her passport should she return to the USA , she settled permanently in China until her death in 1970 , publishing a `` Letter from China . ''
Simplified: Partly from fear of losing her passport if she came back to the USA , she moved to China until her death in 1970 , publishing a `` Letter from China . ''