YOU SAID:

my party is the best party in the history of partys

INTO JAPANESE

私のパーティーは党の歴史の中で最高のパーティー

BACK INTO ENGLISH

My party is the party of the best in the history of the party

INTO JAPANESE

私のパーティーはパーティーの歴史の中で最高のパーティー

BACK INTO ENGLISH

My party is the party of the best in the history of the party