The source sentence is “The page 273, past perfect tense + the adverbial is arrange the words into appropriate sentences”.
Relating to or functioning as an adverb or adverbial. An adverbial phrase, also known as an adverb phrase is a group of words that functions as an adverb in a sentence.
That is it modifies a verb, adjective, adverb, clause or the sentence as a whole. In grammar, an adverbial is a word (an adverb) or a group of words phrase or/and clause that modifies or more closely defines the sentence or the verb.
We use adverbials of manner to say how something happens or how something is done. It’s can modify a verb, an adjective or a complete sentence.
In the phrase “she smiled cheerfully” the word cheerfully is an adverb and in the sentence “she ran quickly” the adverb quickly modifies the verb ran.