YOU SAID:

i am a person that had toast for breakfast

INTO JAPANESE

私は朝食にトーストを食べた人です

BACK INTO ENGLISH

I am the one who ate toast for breakfast

INTO JAPANESE

朝食にトーストを食べたのは私です

BACK INTO ENGLISH

I ate toast for breakfast

INTO JAPANESE

朝食にトーストを食べました

BACK INTO ENGLISH

I ate toast for breakfast