Complex sentence: His mother belonged to the royal family of Arakkal, the only Muslim royal family to have ruled Kerala and his father to Keyees, the well known business family based at Kozhikode and Thalassery.
Split into simpler sentences: His mother belonged to the royal family of Arakkal, the only Muslim royal family to have ruled Kerala. His father belonged to Keyees, the famous business family based at Kozhikode and Thalassery.