Complex sentence: It was discovered by Spanish navigator Juan Díaz de Solís in 1516 and named "San Sebastian de Cádiz", later in 1527 was visited by the Venetian navigator Sebastián Cabot in his expedition to Río de la Plata and Paraná.
Split into simpler sentences: It was discovered by Spanish navigator Juan Díaz de Solís in 1516 and named "San Sebastian de Cádiz". In 1527, it was visited by the Venetian navigator Sebastián Cabot during his expedition to the Río de la Plata and Paraná.