Complex sentence: On 18 April 2017, the Prime Minister Theresa May announced a plan to seek an early parliamentary general election on 8 June 2017, meaning that Parliament would be dissolved at the time the by-election was scheduled to take place.
Split into simpler sentences: On 18 April 2017, the Prime Minister Theresa May announced a plan to seek an early parliamentary general election on 8 June 2017. This will mean Parliament will be dissolved at the time the by-election is scheduled to take place.