Complex sentence: The New Zealand First Party, which had seven MPs in the old parliament, failed to win any electorates or pass the 5 per cent MMP threshold, and therefore won no seats in the new parliament.
Split into simpler sentences: The New Zealand First Party, which had seven MPs in the old parliament, neither gained an electorate seat, nor won over five percent of the party vote. This meant that it failed to clear the MMP threshold, and thus won no seats in the new parliament.