Zuòwéi yí gè wàiláizhě, tā huā le hěn jiǔ cái róngrù.
As an outsider, it took him a long time to fit in.
Tips
usage
外来者 = anyone who came from outside (a village, an industry, a culture). It's neutral on its own but often appears in tension with 本地人 běndìrén (local). For a foreign national specifically, use 外国人 wàiguórén.