YOU SAID:

Today I decided to buy some new shoes for my little sister.

INTO JAPANESE

今日は私の妹のいくつかの新しい靴を購入することを決めた。

BACK INTO ENGLISH

I decided to buy some of my sister's new shoes today.

INTO JAPANESE

その後、姉さんと一緒にパーティーに 行くことを決めたの

BACK INTO ENGLISH

And then I decided to keep my sister company at a party.

INTO JAPANESE

その後、姉さんと一緒にパーティーに 行くことを決めたの

BACK INTO ENGLISH

And then I decided to keep my sister company at a party.