Complex sentence: This brought about the construction of the towns first railway connection, when in 1857 the Chemin de Fer de Paris à Orléans railroad company of Orléans connected Saint-Nazaire to Nantes.
Split into simpler sentences: This brought about the construction of the town's first railway connection. In 1857, the Chemin de Fer de Paris à Orléans railroad company of Orléans connected Saint-Nazaire to Nantes.