YOU SAID:

the orange cat was eating pizza at the party

INTO JAPANESE

オレンジ色の猫がパーティーでピザを食べていた

BACK INTO ENGLISH

An orange cat was eating pizza at a party

INTO JAPANESE

オレンジ色の猫がパーティーでピザを食べていた

BACK INTO ENGLISH

An orange cat was eating pizza at a party