YOU SAID:
the gas the man left in the room was offensive
INTO JAPANESE
男が部屋に残したガスは攻撃的だった
BACK INTO ENGLISH
The gas that the man left in the room was aggressive
INTO JAPANESE
男が部屋に残したガスは積極的だった
BACK INTO ENGLISH
The gas the man left in the room was aggressive
INTO JAPANESE
男が部屋に残したガスは積極的だった
BACK INTO ENGLISH
The gas the man left in the room was aggressive
That didn't even make that much sense in English.