YOU SAID:

The old man was looking for his wife in the park while he was walking the dog.

INTO JAPANESE

その老人は犬の散歩中に公園で妻を探していた。

BACK INTO ENGLISH

The old man was looking for his wife in the park while walking his dog.

INTO JAPANESE

その老人は犬を散歩させながら公園で妻を探していた。

BACK INTO ENGLISH

The old man was looking for his wife in the park while walking his dog.