Complex sentence: Barnaba Chiaramonti was born in Cesena in 1742, the son of Count Scipione Chiaramonti; his mother, Giovanna, was the daughter of the Marquess Ghini and through her the future Pope Pius VII was related to the Braschi family, the family of Pope Pius VI.
Split into simpler sentences: Barnaba Chiaramonti was born in Cesena in 1742, the son of Count Scipione Chiaramonti. His mother, Giovanna, was the daughter of the Marquess Ghini; through her, the future Pope Pius VII was related to the Braschi family of Pope Pius VI.