Complex sentence: In a letter of August 21, the Crown Prince wrote in general that "no mercy" was to be shown and that "fear has to be chased into these humans", afterward, he suggested that the Chancery initiate a trial and subsequently execute them.
Split into simpler sentences: In a letter of 21 August, the Crown Prince wrote in general that "no mercy" was to be shown and that "fear has to be chased into these humans". He suggested that the Chancery initiate a trial and subsequently execute them.