Complex sentence: The funeral was, in keeping with Foss' own wishes, open to the public and was also attended by King Harald and Queen Sonja of Norway, as well as Prime Minister Jens Stoltenberg.
Split into simpler sentences: The funeral was, in keeping with Foss' own wishes, open to the public. It was also attended by King Harald and Queen Sonja of Norway, as well as Prime Minister Jens Stoltenberg.