You will be given a definition of a task first, then some input of the task.
In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.

Archaeological evidence shows that Upper Egyptian culture replaced this Buto culture at the delta when Lower Egypt and Upper Egypt were unified , and the replacement is considered important evidence for the unification of the two portions of Ancient Egypt into one entity .
Output:
Archaeological evidence shows that Upper Egyptian culture replaced the Buto-culture at the delta when Upper and Lower Egypt were unified .