Complex sentence: Eliza Jane Poitevent was born in Gainesville, Mississippi on 11 March 1843 (some sources implausibly say 1849), the third child of a prosperous family of five, with a busy father and sickly mother.
Split into simpler sentences: Eliza Jane Poitevent was born in Gainesville, Mississippi on 11 March 1843 (some sources say 1849). She was the third child of a prosperous family of five, with a busy father and sickly mother.