In Sentence structures^x, Underline^x

Consider the following dialogue:Person #1: "You're crazy!"Person #2: "I'm not crazy. I merely claim to be Napoleon come back from the grave."After doing a Google search for "I merely claim to be", I was surprised to find that the phrase is not nearly as...

I don't understand the sentence structure below with the bule words underline. A new world record has been was set on August,14 at the Sziget Festival when 3000 participants wearing red T-shirts formed a giant heart. Thx