Complex sentence: It uses a light source of polarized light with a wavelength of 550 nanometers, the isobestic point for hemoglobin, thus imaging the erythrocytes as they are flowing through the small blood vessels.
Split into simpler sentences: It uses a light source of polarized light with a wavelength of 550 nanometers, the isobestic point for hemoglobin. Thus imaging the erythrocytes as they are flowing through the small blood vessels.