Complex sentence: El Kahzani had reportedly lived in Belgium and the Spanish cities of Madrid and Algeciras from 2007 to March 2014 before moving to France, at which time the Spanish authorities informed the French of their suspicions.
Split into simpler sentences: El Kahzani had reportedly lived in Belgium and the Spanish cities of Madrid and Algeciras from 2007 to March 2014. He later moved to France, at which time the Spanish authorities informed the French of their suspicions.