Complex sentence: In elections of 2001 and 2006, which were contested by international observers, Western powers and internal opposition parties, the incumbent Lukashenko defeated the other candidates within the first ballot, thus being the only person to have served as President of Belarus.
Split into simpler sentences: In elections of 2001 and 2006, which were contested by international observers, Western powers and internal opposition parties, the incumbent Lukashenko defeated the other candidates within the first ballot. As of 2007, he is the only person to have served as President of Belarus.