Complex sentence: ACF built these cars between 1932 and 1933, and were practically identical to the original R1 order, though the R4s had a slightly different side door panel than the R1, adding small handle notches below the door window.
Split into simpler sentences: ACF built these cars between 1932 and 1933, and were practically identical to the original R1 order. The R4s had a slightly different side door panel than the R1, adding small handle notches below the door window.