Complex sentence: He is the son of the fighter of the National Resistance Mimis Mazomenos, grandson of Afroditi Papanastasiou that was first cousin of Alexandros Papanastasiou, the first president of the Greek Republic (1924).
Split into simpler sentences: He is the son of the fighter of the National Resistance Mimis Mazomenos. His granmother was first cousin of Alexandros Papanastasiou, the first president of the Greek Republic (1924).