YOU SAID:

Within guests at the party were some of my friends from high school.

INTO JAPANESE

パーティーのゲストの中には、高校時代の友人もいました。

BACK INTO ENGLISH

Some of the party guests were high school friends.

INTO JAPANESE

パーティーの客の中には高校時代の友人もいた。

BACK INTO ENGLISH

Some of the party guests were friends in high school.

INTO JAPANESE

パーティーの客の中には高校時代の友人もいた。

BACK INTO ENGLISH

Some of the party guests were friends in high school.