YOU SAID:

I've got sweatbands on my arm and I don't know where they came from.

INTO JAPANESE

私は私の腕に汗止めバンドを持っています、そして、私は彼らがどこから来たのかわかりません。

BACK INTO ENGLISH

I have a sweat band on my arms, and I do not know where they came from.

INTO JAPANESE

私は私の腕に汗バンドを持っています、そして私は彼らがどこから来たのか知りません。

BACK INTO ENGLISH

I have a sweat band on my arms, and I do not know where they came from.