Complex sentence: The primaries were eventually won by Amram Mitzna, whom at that point in time was the Mayor of Haifa, as he won 53% of the votes while Ben Eliezer won 38% of the votes and Haim Ramon won only 7% of the votes.
Split into simpler sentences: The primaries were eventually won by Amram Mitzna, who at that point in time was the mayor of Haifa. He won 53% of the votes while Ben Eliezer won 38% of the votes and Haim Ramon won only 7% of the votes.