YOU SAID:

He walked the dog until the dog walker walked

INTO JAPANESE

彼は犬の散歩人が歩くまで犬の散歩を続けた

BACK INTO ENGLISH

He walked the dog until the dog walker walked.

INTO JAPANESE

彼は犬の散歩人が歩き出すまで犬の散歩を続けた。

BACK INTO ENGLISH

He continued walking the dog until the dog walker started walking away.

INTO JAPANESE

彼は犬の散歩をしていた人が立ち去り始めるまで犬の散歩を続けた。

BACK INTO ENGLISH

He continued walking his dog until the dog walker started to leave.

INTO JAPANESE

彼は犬の散歩をしていた人が立ち去るまで犬の散歩を続けた。

BACK INTO ENGLISH

He continued walking his dog until the dog walker left.

INTO JAPANESE

彼は犬の散歩人が去るまで犬の散歩を続けた。

BACK INTO ENGLISH

He continued walking his dog until the dog walker left.