Complex sentence: In 1899, Charlois received the Prix Jules Janssen, the highest award of the Société astronomique de France, the French astronomical society, and was also awarded the Valz Prize by the French Academy of Sciences in 1889 for his work on calculating asteroid orbits.
Split into simpler sentences: In 1899, Charlois received the Prix Jules Janssen, the highest award of the Société astronomique de France (the French astronomical society). He was awarded the Valz Prize by the French Academy of Sciences in 1889 for his work on calculating asteroid orbits.