Complex sentence: The Hall was one of many to be demolished in the 20th century, when in 1912 its owner, the 4th Duke of Sutherland, razed it after his offer to give it to the people of Stoke-on-Trent was rejected.
Split into simpler sentences: The Hall was one of many to be demolished in the 20th century. It was demolished in 1912 by its owner, the 4th Duke of Sutherland, who razed it after his offer to give it to the people of Stoke-on-Trent was rejected.