Complex sentence: The couple continue traveling with the Doctor who allows them a honeymoon, which they are said to be on in both "The Sarah Jane Adventures" serial "Death of the Doctor" and the Christmas special "A Christmas Carol".
Split into simpler sentences: The couple continue traveling with the Doctor, who allows them a honeymoon. They are said to still be on their honeymoon in both "The Sarah Jane Adventures" serial "Death of the Doctor" and the Christmas special "A Christmas Carol".