YOU SAID:

History has been working for a few years

INTO JAPANESE

歴史は数年前から機能しています

BACK INTO ENGLISH

History has been working for years

INTO JAPANESE

歴史は何年にもわたって機能してきた

BACK INTO ENGLISH

History has worked for years

INTO JAPANESE

歴史は何年にもわたって機能してきた

BACK INTO ENGLISH

History has worked for years