Complex sentence: During the 2016 legislative election, among 365 candidates there were 63 candidates who came from a political family, among these candidates, 40 of them were children of a former politician.
Split into simpler sentences: During the 2016 legislative election, among 365 candidates 63 of them came from a political family. Furthermore, among those who came from a political family, 40 of them were children of a former politician.