Complex sentence: An interim governor, Esteban José Francisco Mestivier, was appointed by the Buenos Aires Government, who with his family arrived at Puerto Luis aboard the schooner "Sarandí" in October 1832.
Split into simpler sentences: An interim governor, Esteban José Francisco Mestivier, was appointed by the Buenos Aires Government. He arrived at Puerto Luis with his family aboard the schooner "Sarandí" in October 1832.