Complex sentence: On 31 August 2015, ČT announced that it would participate in the 2016 edition, in-which they qualified to final for the first time in Czech Republic's Eurovision history.
Split into simpler sentences: On 31 August 2015, ČT announced that it would participate in the 2016 edition. In the 2016, Czech Republic has qualified to the finals first time in Czech Republic's Eurovision history.