Complex sentence: Lazarević appointed voivode Mazarek to administer his possessions in Zeta, and concluded the six-months truce with Venice and left to support king Sigismund in his fight against the Hussites.
Split into simpler sentences: Lazarević appointed voivode Mazarek to administer his possessions in Zeta. Lazarević concluded the six-months truce with Venice and left to support king Sigismund in his fight against the Hussites.