Complex sentence: After the election, the Liberals entered negotiations with the Green Party of British Columbia, which held the balance of power in the legislature, however on May 29,2017 the Greens instead reached a supply agreement with the official opposition NDP.
Split into simpler sentences: After the election, the Liberals entered negotiations with the Green Party of British Columbia, which held the balance of power in the legislature. On May 29,2017 the Green Party eached a supply agreement with the official opposition NDP.