Complex sentence: There is no stethoscope, microscope, sphygmomanometer or thermometer in the picture, well known instruments of physicians in the late 19th century which saved time, and it may be that they were omitted in order to show the doctors' "professional and personal commitment".
Split into simpler sentences: There is no stethoscope, microscope, sphygmomanometer or thermometer in the picture, well known instruments of physicians in the late 19th century which saved time. It may be that they were omitted in order to show the doctors' "professional and personal commitment".