Complex sentence: Dalkeith Palace has not been lived in by the Buccleuch family since 1914 and has been leased to the University of Wisconsin system for a study abroad programme since 1985.
Split into simpler sentences: Dalkeith Palace has not been lived in by the Buccleuch family since 1914. Since 1985 it has been leased to the University of Wisconsin system for a study abroad programme since 1985.