Complex sentence: As Metiria Turei stepped down as co-leader of the Green Party during the midst of the election and the party did not have adequate time to elect a replacement, an election for the female co-leadership is to be conducted at the 2018 party annual general meeting.
Split into simpler sentences: As Metiria Turei stepped down as co-leader of the Green Party during the midst of the election, the party did not have adequate time to elect a replacement. Thusly, an election for the female co-leadership will be conducted at the 2018 party annual general meeting.