Complex sentence: He built the first Dobson ozone spectrophotometers and studied the results over many years, the Dobson unit, a unit of measurement of atmospheric ozone, specifically ozone in the stratospheric ozone layer, is named after him.
Split into simpler sentences: He built the first Dobson ozone spectrophotometers and studied the results over many years. The Dobson unit, a unit of measurement of atmospheric ozone, specifically ozone in the stratospheric ozone layer, is named after him.