YOU SAID:

I pooped out of my but and ate my sister

INTO JAPANESE

私はうんちをしましたが、妹を食べました

BACK INTO ENGLISH

I pooped but ate my sister

INTO JAPANESE

うんちしたけど妹を食べた

BACK INTO ENGLISH

I was pooping but I ate my sister

INTO JAPANESE

うんちをしていましたが、妹を食べました

BACK INTO ENGLISH

I was pooping, but I ate my sister

INTO JAPANESE

うんちをしていましたが、妹を食べました

BACK INTO ENGLISH

I was pooping, but I ate my sister