YOU SAID:

While my hair is blue, my friend's hair is green

INTO JAPANESE

私の友人の髪が緑髪は青いが、

BACK INTO ENGLISH

But my friend's hair is blue green hair

INTO JAPANESE

しかし、私の友人の髪は青い緑髪

BACK INTO ENGLISH

However, my friend's hair is blue green hair.

INTO JAPANESE

しかし、私の友人の髪は青い緑髪です。

BACK INTO ENGLISH

However, my friend's hair is blue green hair.