YOU SAID:

I heard that Ella is throwing a huge party at her house

INTO JAPANESE

エラが彼女の家で大規模なパーティーを開いていると聞いた

BACK INTO ENGLISH

I heard Ella was having a big party at her house.

INTO JAPANESE

エラが彼女の家でパーティーを開いていると聞いた。

BACK INTO ENGLISH

I heard that Ella was having a party at her house.

INTO JAPANESE

エラが家でパーティーをしていると聞いた。

BACK INTO ENGLISH

I heard that Ella was having a party at her house.