Complex sentence: Both Spencers are executed, and the king himself is taken first to Kenilworth and then to Berkeley Castle, where he meets his death at the hands of the luxuriously cruel Lightborn, whose name is an anglicised version of "Lucifer".
Split into simpler sentences: Both Spencers are executed, and the king himself is taken first to Kenilworth and then to Berkeley Castle. There he meets the luxuriously cruel Lightborn, whose name is an anglicised version of "Lucifer".