Complex sentence: In his accompanying TV-speech he claimed the elections were necessary to "purify the Rada of the mainstay of (former president Viktor) Yanukovych"; who according to Poroshenko "clearly do not represent the people who elected them".
Split into simpler sentences: In his accompanying television address, he said the elections were necessary to "purify the Rada of the mainstay of (former president Viktor) Yanukovych". These deputies, Poroshenko said, "clearly do not represent the people who elected them".