Complex sentence: The wording is used to make clear it does not change the period to the next ordinary election, and the Members of Parliament (riksdagsledamöter) elected merely serve out what remains of the four-year parliamentary term.
Split into simpler sentences: The wording is used to make clear it does not change the period to the next ordinary election. Any new deputies who win seats in such an election merely serve out the balance of the four-year parliamentary term.