Complex sentence: Of these, the nationalist Rodina (Motherland) was the largest, having won 9% of the popular vote in the 2003 Duma elections and by the time of the merger had 37 seats in the Duma.
Split into simpler sentences: Of these, the nationalist "Rodina" (Motherland) was the largest, having won 9% of the popular vote in the 2003 Duma elections. At the time of the merger Rodina had 37 seats in the Duma.