Complex sentence: The oldest known seal of Oslo showed the same composition as today's seal, except that instead of a human figure reclining at the feet of St. Hallvard, there was an armed warrior; one of the evil men who killed Hallvard.
Split into simpler sentences: The oldest known seal of Oslo showed the same composition as today's seal, except the human figure reclining at the feet of St. Hallvard. In the original seal, it represented an armed warrior, one of the evil men who killed Hallvard.