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.
--------
Question: The Pentagon is the headquarters building of the United States Department of Defense , although as a symbol of the U.S. military , the phrase " The Pentagon " is also often used as a metonym for the Department of Defense and its leadership .

Answer: The Pentagon is the headquarters of the United States Department of Defense .

Question: All of the yews are very closely related to each other , and some botanists treat them all as subspecies or varieties of just one widespread species ; under this treatment , the species name used is " Taxus baccata " , the first yew described scientifically .

Answer: All of the yews are very closely related to each other , and often described together as " Taxus baccata " .

Question: The Cyperaceae are a family of graminoid ( grass-like ) , monocotyledonous flowering plants known as sedges , which superficially resemble the closely related rushes and the more distantly related grasses .

Answer:
The family Cyperaceae , or the sedges , is a taxon of flowering plants that superficially resemble grasses or rushes .