Definition: In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Input: Scientists later looked back to the hours before the eruption and noticed that several long period earthquakes had occurred .
Output:
Scientists later looked back to the hours before the eruption and noticed that several long-period earthquakes , which start out strong and then slowly die out , had occurred in the final hours before the eruption .