YOU SAID:

we crossed the street and saw the red police car

INTO JAPANESE

通りを渡ると赤いパトカーが見えた。

BACK INTO ENGLISH

As I crossed the street, I saw a red police car.

INTO JAPANESE

通りを横切ると、赤いパトカーが見えた。

BACK INTO ENGLISH

As I crossed the street, I saw a red police car.