Complex sentence: The vergobret was chosen from among the most powerful people and coins have been found in the effigies of Aedui and Remi vergobrets (for instance, staters at the effigy of Dumnorix).
Split into simpler sentences: The vergobret was chosen from among the most powerful people. Coins have been found in the effigies of Aedui and Remi vergobrets (for instance, staters at the effigy of Dumnorix).