Complex sentence: There is a biannual outdoor play performed on Ålhus called "Hugleikssonspelet" which is written by Edvard Hoem, based on a book by Anne Cecilie Kapstad which commemorates Audun Hugleiksson.
Split into simpler sentences: There is a biannual outdoor play performed at Ålhus called "Hugleikssonspelet". Written by Edvard Hoem and based on a book by Anne Cecilie Kapstad the play commemorates the life of Audun Hugleiksson.