Complex sentence: On Feb 11th, 2007, during the celebration of the 28th anniversary of Iran's Islamic revolution, an Iranian man named Amir Moussavi, 32, fell to his death infront of tens of thousands celebrating while free climbing the tower.
Split into simpler sentences: On Feb 11th 2007, during the celebration of 28th anniversary of Iran's Islamic revolution. An Iranian man named Amir Moussavi, 32, fell to his death infront of tens of thousands celebrating while free climbing the tower.