YOU SAID:

Ithis is my friend that is my friends friend and this is my party

INTO JAPANESE

私は私の友人の友人であり、これは私のパーティーです

BACK INTO ENGLISH

I am a friend of my friend and this is my party

INTO JAPANESE

私は私の友人の友人であり、これは私のパーティーです

BACK INTO ENGLISH

I am a friend of my friend and this is my party