the plant ended up small.

中文意思：工厂最终变小了

这家工厂最后很小

small在句中应该是状语成语成分，表示工厂最终变小的状态。

ended up

英[ˈendɪd ʌp]

美[ˈendɪd ʌp]

结束，终止，入选

例句

Davies is a striker of limited natural talent and yet he's ended up playing for England and has made an excellent career for himself.

戴维斯是那种没什么天赋的射手，但他曾入选国家队。职业生涯也堪称壮丽。