Complex sentence: The Convention's unanimous declaration of a French Republic on 21 September 1792 left open the fate of the King; a commission was therefore established to examine evidence against him while the Convention's Legislation Committee considered legal aspects of any future trial.
Split into simpler sentences: The Convention's unanimous declaration of a French Republic on 21 September 1792 left open the fate of the king. A commission was therefore established to examine evidence against him while the Convention's Legislation Committee considered legal aspects of any future trial.