Complex sentence: The dye solution is usually circulated at high speeds, to help avoid triplet absorption and to decrease degradation of the dye a prism or diffraction grating is usually mounted in the beam path, to allow tuning of the beam.
Split into simpler sentences: The dye solution is usually circulated at high speeds, to help avoid triplet absorption and to decrease degradation of the dye. A prism or diffraction grating is usually mounted in the beam path, to allow tuning of the beam.