Which revision corrects the error in sentence structure in the paragraph?

In 1967 Katherine Switzer signed up for the Boston marathon using her first and middle name initials instead of her full name, at that time, only men were permitted to officially register and receive a number for the legendary race. Once officials realized a woman was attempting to run in the race, they made efforts to remove her from the competition. Switzer prevailed and finished in just over four hours, paving the way for them to officially rule change that allow for the inclusion of women. In 2017, told mark the fiftieth anniversary of this pioneering event, a seventy-year-old Switzer repeated her run, wearing the number 261, the same number she had worn in that first run in 1967.