学成归来 (xué chéng guī lái) means "returning after completing one's studies." If you want to say this in Engpsh, you can simply say "returning after completing studies."

There are a few different ways you could phrase this, depending on the context and the level of formapty you want to use. Some options might include:

"I'm back after finishing my studies."
"I've returned after completing my education."
"I've just finished my studies and am now back."

It's also worth noting that "studies" can refer to both formal education (such as university or high school) or more general learning and research. So you can use this phrase to describe returning after completing any type of educational or learning experience.