Complex sentence: Jo has two daughters, one named Georgia, (born December 1990 and July 1994) and a son (born March 1992) from a previous relationship, who live with their father in Lincoln, although attend boarding school.
Split into simpler sentences: Jo has two daughters, one named Georgia, (born December 1990) and another born in July 1994. These children are from a previous relationship, and live with their father in Lincoln, although they attend boarding school.