YOU SAID:

I see what happened there

INTO JAPANESE

そこで起こったことがわかります

BACK INTO ENGLISH

I understand that happened there

INTO JAPANESE

私はそこで起こったことを理解しています

BACK INTO ENGLISH

I understand what happened there

INTO JAPANESE

私はそこで何が起こったのか理解しています

BACK INTO ENGLISH

I understand what happened there