YOU SAID:

He dyed the back of his head blue until it was an ocean

INTO JAPANESE

彼は頭の後ろを海になるまで青く染めた

BACK INTO ENGLISH

He dyed the back of his head blue until it became the sea

INTO JAPANESE

彼は頭の後ろを海になるまで青く染めた

BACK INTO ENGLISH

He dyed the back of his head blue until it became the sea