Complex sentence: The cost of the three-year project were approximately 4 million euros and were part of the program space of the Helmholtz Association of German Research Centres (HGF) and applied to the DLR.
Split into simpler sentences: The cost of the three-year project was approximately 4 million euros. It was part of the space program of the Helmholtz Association of German Research Centers (HGF) and the DLR.