Original sentence: Eyewitness accounts state the elderly woman, who passed away, may have suffered a heart attack which triggered the accident.It has been reported the collapse was caused by a car colliding with a retaining wall on the deck's third and highest level.On 6 December, 2007 at approximately 12:15 PM EST a portion of the Nordstrom/Neiman Marcus parking deck collapsed by a person dying.This was the second American parking structure to collapse in a fortnight leading people to question the structural integrity of the buildings
Edited sentence: Eyewitness accounts stated an elderly woman may have suffered a heart attack, which triggered the accident.On 6 December, 2007 at approximately 12:15 PM EST a portion of the Nordstrom/Neiman Marcus parking deck collapsed.The collapse of the deck was caused by a car colliding with a retaining wall on the third and highest level.This was the second American parking structure to collapse in a two weeks, leading people to question the structural integrity of such buildings