Complex sentence: A is a portable multi-paneled silk partition supported by a two-rod T-pole which came into use in aristocratic households during and following the Heian period in Japan when it became a standard piece of furniture.
Split into simpler sentences: A is a portable partition supported by a two-rod T-pole bearing many panels of silk. It came into use in aristocratic households during and following the Heian period in Japan and became a standard piece of furniture.