Complex sentence: A by-election for the Trutnov Senate seat in the Czech Republic will be held on 5 and 6 January 2018, with the prospective second round on 12 and 13 January 2018.
Split into simpler sentences: A by-election for the Trutnov Senate seat in the Czech Republic is be held in 2018. The first round was held 5 and 6 January 2018, with the prospective second round on 12 and 13 January 2018.