YOU SAID:
I had a sandwich for lunch today
INTO JAPANESE
今日のお昼にサンドイッチを食べた
BACK INTO ENGLISH
Ate a sandwich for lunch today
INTO JAPANESE
今日は昼食にサンドイッチを食べた
BACK INTO ENGLISH
Today I ate a sandwich lunch
INTO JAPANESE
今日はサンドイッチのランチを食べました
BACK INTO ENGLISH
Today I ate a sandwich lunch
That didn't even make that much sense in English.