Simplify the following text for a Grade 6 native English-speaking person.
Original: The 1707 HÅ ei earthquake , which occurred at 14:00 local time on October 28 , 1707 , was the largest in Japanese history until the 2011 TÅ hoku earthquake surpassed it .
Simplified: The 1707 HÅ ei earthquake happened at 14:00 local time on 28 October 1707 . It was the largest earthquake in Japanese history .