Complex sentence: For the first German sponsored Spacelab mission D-1 Reinhard Furrer and Ernst Messerschmid were selected in 1983, both flew on STS-61-A in 1985.
Split into simpler sentences: For the first German sponsored Spacelab mission D-1, Reinhard Furrer and Ernst Messerschmid were selected in 1983. Both flew again on STS-61-A in 1985.