Complex sentence: At the door is a strange man that claims to be the butler of the children's' wealthy grandfather Edward the duke of Castlebury, he gives them a invitation to spend the christmas holidays with him at his castle in Europe.
Split into simpler sentences: At the door is a strange man that claims to be the butler of the children's' wealthy grandfather, Edward, the Duke of Castlebury. He gives them a invitation to spend the Christmas holidays with the Duke at his castle in Europe.