YOU SAID:

it's a part of the party that they are taking part in, but it is not the funny part of the party

INTO JAPANESE

それは彼らが参加しているパーティーの一部ですが、それはパーティーの面白い部分ではありません

BACK INTO ENGLISH

It's part of the party they're attending, but it's not an interesting part of the party

INTO JAPANESE

それは彼らが参加しているパーティーの一部ですが、パーティーの興味深い部分ではありません

BACK INTO ENGLISH

It's part of the party they're attending, but it's not an interesting part of the party