Complex sentence: Adel Abdessemed began his artistic production in Batna (1986-1990), then in Algiers, in the École Nationale Supérieure des Beaux-Arts, from where he left in 1994 consequently to the assassination of the director Ahmed Asselah and his son inside the school.
Split into simpler sentences: Adel Abdessemed began his artistic production in Batna (1986-1990). He then studied in Algiers at the École Nationale Supérieure des Beaux-Arts, where he left in 1994 after the assassination of director Ahmed Asselah and his son inside the school.