Complex sentence: The Deutsche Post/DHL GoGreen program plans to reduce emissions of greenhouse gases and local air pollutants; the company has four interim goals for doing so, to be achieved by the year 2025.
Split into simpler sentences: The Deutsche Post/DHL GoGreen program is intended to reduce emissions of greenhouse gases and local air pollutants. The company has four interim goals for doing so, to be achieved by the year 2025.