Complex sentence: The Scout Association owned the legal copyright to "Scouting for Boys" in the UK, until 31 December 2012, when the copyright expired at the end of the 70th year after the death of its author on 8 January 1941.
Split into simpler sentences: The Scout Association owns the copyright to "Scouting for Boys" in the UK. The book enters the public domain at the end of 2011, at the end of the 70th year after the death of its author on 8 January 1941.