A modifying clause is a group of words (a phrase or clause) acting together as a single adjective or adverb. To "modify" a noun or pronoun means to give extra information about it. To "modify" a verb, an adverb, or an adjective means to give extra information about it.
You can't move or "commacize" a bound clause/phrase because bound clauses/phrases can't be set off. You can usually determine how tightly bound a clause is by removing it from the sentence and then asking this question: "does the meaning of the sentence or the word being modified change very much with this modifier missing?" If the answer is "yes," then the modifier is "bound" and doesn't need commas to offset it.
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