Complex sentence: The law was amended in 2013 to allow the use of an emblem by candidates standing jointly for two parties; this allowed Labour and Co-operative Party candidates to use the registered Labour Party emblem in the United Kingdom general election, 2015.
Split into simpler sentences: The law was subsequently updated in 2013 to allow the use of an emblem by candidates standing jointly for two parties. This will allow Labour and Co-operative Party candidates to use the registered Labour Party emblem in the United Kingdom general election, 2015.