YOU SAID:
the red reader read the red book that had been read when the reader was reading the other red book
INTO JAPANESE
赤い読者は、読者が他の赤い本を読んでいたときに読んだ赤い本を読んだ
BACK INTO ENGLISH
The red reader read the red book he read while he was reading another red book
INTO JAPANESE
赤い読者は、別の赤い本を読んでいるときに読んだ赤い本を読んだ
BACK INTO ENGLISH
The red reader read the red book he read while reading another red book
INTO JAPANESE
赤い読者は別の赤い本を読みながら読んだ赤い本を読んだ
BACK INTO ENGLISH
The red reader read the red book he read while reading another red book
This is a real translation party!