Complex sentence: As mentioned in the previous paragraph, "Venus Express" is outfitted mostly with spare parts and designs from the "Mars Express" and "Rosetta" missions, but has been adapted to cope with the high radiation and thermal environment surrounding Venus.
Split into simpler sentences: As mentioned in the previous paragraph, "Venus Express" is outfitted mostly with spare parts and designs from the "Mars Express" and "Rosetta" missions. The spacecraft has been adapted to cope with the high radiation and thermal environment surrounding Venus.