Complex sentence: In 1837, the ducal residence moved back to Schwerin, but the building was in a relatively bad condition, and the Grand Duke disliked the individual buildings' incongruent origins and architectural styles.
Split into simpler sentences: In 1837, the ducal residence moved back to Schwerin, but the building was in relatively bad condition. Additionally, the Grand Duke didn't like the individual buildings' incongruent origins and architectural styles.