Complex sentence: The ruins and surroundings have been slowly encroached upon by houses built by the Muslim Sunni villages which, over the last 200 years, have replaced the Christians in that area due to the Turkish invasion under the old Ottoman Empire which ruled Lebanon for over 400 years.
Split into simpler sentences: The ruins and surroundings have been slowly encroached upon by houses built by the Muslim Sunni villages which, over the last 200 years. They have replaced the Christians in that area due to the Turkish invasion under the old Ottoman Empire which ruled Lebanon for over 400 years.