Instructions: 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: The natural sway motion of people walking caused small sideways oscillations in the bridge .
Output:
The natural sway motion of people walking caused small sideways oscillations in the bridge , which in turn caused people on the bridge to sway in step , increasing the amplitude of the bridge oscillations and continually reinforcing the effect .