YOU SAID:
Having been some time under instruction
INTO JAPANESE
しばらく指導を受けていた
BACK INTO ENGLISH
I was instructed for a while
INTO JAPANESE
しばらく指示されました
BACK INTO ENGLISH
Instructed for a while
INTO JAPANESE
しばらく指示された
BACK INTO ENGLISH
Instructed for a while
That didn't even make that much sense in English.