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The given statement is an example of a phrase, specifically, a participial phrase. The element that is necessary to complete the sentence is an independent clause. A participial phrase consists of words with the -ing or -en form plus its modifiers. This kind of phrase always functions as an adjective. The phrase "Beginning in the fall of 1957" is describing a certain noun, which is found in the independent clause.
Answer:
Theodore Roosevelt, the twenty-sixth president of the United States, was the youngest president to ever hold office.
Explanation:
I think grueling means extremely tiring or demanding
