YOU SAID:

I was mad at the sisters because I had sent an email and I didn't feel like they responded fast enough

INTO JAPANESE

私は電子メールを送っていたので姉妹に腹を立てていたし、彼らが十分に速く反応したようには思わなかった

BACK INTO ENGLISH

I was angry with my sister because I was sending an e-mail and I did not think they responded fast enough

INTO JAPANESE

私は私が電子メールを送っていたので私は私の妹に腹を立てていました、そして私は彼らが十分に速く反応したとは思いませんでした

BACK INTO ENGLISH

I was angry with my sister as I was sending an email, and I did not think they reacted fast enough

INTO JAPANESE

私は私が電子メールを送っていたので私は私の姉と怒っていた、そして私は彼らが十分に速く反応したとは思わなかった

BACK INTO ENGLISH

I was angry with my sister as I was sending an email, and I did not think they responded fast enough

INTO JAPANESE

私は私が電子メールを送っていたので私は私の姉と怒っていた、そして私は彼らが十分に速く反応したとは思わなかった

BACK INTO ENGLISH

I was angry with my sister as I was sending an email, and I did not think they responded fast enough