Complex sentence: Korsi are generally heated with electric elements or traditionally with a brazier with hot coals is placed under the table, and covered with a thick cloth overhanging on all sides to keep its occupants warm.
Split into simpler sentences: Korsi are generally heated with electric elements or, traditionally, with a brazier containing hot coals that is placed under the table. The table is covered with a thick cloth overhanging on all sides to keep its occupants warm.