I would add "a" before the word "meeting"; and I believe the subordinate clause needs a comma before it: During a meeting of the company’s administrative board on January 5, 2014 , in which the matter regarding renewal of sales rights was adjudicated, the partner submitted to the board a lease agreement with the building owner.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.