Complex sentence: No single presidential ticket obtained more than half of the total valid votes thus leading to a runoff election held on June 4,2006 between the two candidates with most votes, Ollanta Humala and Alan García.
Split into simpler sentences: No single presidential ticket obtained more than half of the total valid votes. Thus a runoff election was held on June 4,2006 between the two candidates with most votes, Ollanta Humala and Alan García.