YOU SAID:
when I drive my car i eat my sandwich
INTO JAPANESE
私は私の車を運転するとき私は私のサンドイッチを食べる
BACK INTO ENGLISH
I eat my sandwich when I drive my car
INTO JAPANESE
私は私の車を運転するときに私のサンドイッチを食べる
BACK INTO ENGLISH
I eat my sandwich when I drive my car
That didn't even make that much sense in English.