Final answer:
The statement is false because the clause 'who help to raise awareness' is essential for identifying which celebrities are meant, and thus, no comma is necessary.
Step-by-step explanation:
When considering whether a clause is nonrestrictive (nonessential) and needs to be set off by commas, it is important to determine if the information it contains is necessary for the basic meaning of the sentence. The sentence “Celebrities who help to raise awareness of significant world issues are more likely to have long-lasting bonds with their fans” contains a clause that is essential to the meaning. This is because without it, we wouldn't know which celebrities are being referred to.
Therefore, it is a restrictive (essential) clause, and no comma should be placed before the clause. The idea that adding commas to nonessential information helps the reader understand the sentence's meaning is particularly true when it comes to distinguishing between essential and nonessential information. The clause in the sentence is essential to identifying the subject, which is why no comma is needed, making the statement false.