Complex sentence: John Frederick was captured (by the Hungarian hussars during the battle) and arrested, in the course of the Capitulation of Wittenberg a few weeks later he had to resign the electoral dignity and the major part of his lands in favour of his cousin Maurice.
Split into simpler sentences: John Frederick was captured (by the Hungarian hussars during the battle) and arrested. In the course of the Capitulation of Wittenberg a few weeks later he had to resign the electoral dignity and the major part of his lands in favour of his cousin Maurice.