Complex sentence: As of 2013, Mofid, Keshavarzi, Agah and Nahayat Negar were the top 4 performers among TSE's brokerage firms with executing 41 percent of the total value in on-line trading.
Split into simpler sentences: As of 2013, "Mofid", "Keshavarzi", "Agah" and "Nahayat Negar" were the top 4 performers among TSE's brokerage firms. These firms executing 41% of the total value in on-line trading.