YOU SAID:
The jumping frog liked frogs that were jumping
INTO JAPANESE
ジャンプカエルはジャンプしていたカエルが好き
BACK INTO ENGLISH
The jump frog likes the frog that was jumping
INTO JAPANESE
ジャンプカエルはジャンプしていたカエルが好き
BACK INTO ENGLISH
The jump frog likes the frog that was jumping
That didn't even make that much sense in English.