Complex sentence: The building is located in the Old City portion of Awjila town which was in ancient times part of a caravan route in the Sahara desert between the Mediterranean Sea coast and Fazan town.
Split into simpler sentences: The building is located in the Old City portion of Awjila town. In ancient times, Awjila was located along a caravan route in the Sahara desert between the Mediterranean Sea coast and Fazan town.