Complex sentence: Rivero was born in Concepción del Uruguay, at that time a rural village in Entre Ríos Province, Argentina on November 27,1808, and at the ago of twenty was taken to the Falkland Islands by Luis Vernet, to work as a gaucho.
Split into simpler sentences: Rivero was born in Concepción del Uruguay, at that time a rural village in Entre Ríos Province, Argentina on November 27,1808 ´. When he was about twenty years old, he was taken to the Falkland Islands by Luis Vernet, to work as a gaucho.