Complex sentence: Calero was born in 1906 during the Porfirio Díaz regime, into a liberal and well-connected family, granddaughter of Justo Sierra and cousin of Javier Barros Sierra.
Split into simpler sentences: Calero was born in 1906 during the Porfirio Díaz regime, into a liberal and well-connected family. She was the granddaughter of Justo Sierra and cousin of Javier Barros Sierra.