Complex sentence: In 1870 he was involved in the use of balloons to carry mail out of the city during the Siege of Paris, and established a balloon manufacturing works in the Gare d'Orléans (Gare d'Austerlitz).
Split into simpler sentences: In 1870 he was involved in the use of balloons to carry mail out of the city during the Siege of Paris. He established a balloon manufacturing works in the Gare d'Orléans (Gare d'Austerlitz).