Complex sentence: San José de Mayo was founded on 1 July 1783 and during the 19th century it became a commercial and cultural centre, known as "Montevideo chico" ("little Montevideo").
Split into simpler sentences: San José de Mayo was founded on 1 July 1783. During the 19th century it became a commercial and cultural centre, known as "Montevideo chico" ("little Montevideo").