Complex sentence: Agda and Olof had traveled to one of Olof's friends in Husaby, and was just about to be married, when their wedding ceremony was interrupted and the banishment declared for those present.
Split into simpler sentences: Agda and Olof had traveled to one of Olof's friends in Husaby. They weres just about to be married, when their wedding ceremony was interrupted and the banishment declared for those present.