YOU SAID:

i once was slapped harshly by a clown fish on my left thigh

INTO JAPANESE

私はかつて私の左太ももにピエロの魚によって激しく叩かれた

BACK INTO ENGLISH

I was once violently slapped by a clown fish on my left thigh

INTO JAPANESE

私はかつて私の左太ももにピエロの魚に激しく叩かれた

BACK INTO ENGLISH

I was once violently slapped by a clown fish on my left thigh