Identify the pronoun serving as the subject of the following sentence. During commercial breaks, we changed the channel to watch Peeta Mellark's new television show.

1. The hamburger came from Hamburg, Germany, and the hot dog came from Frankfurt. - compound sentence

A sentence which contains two independent clauses with related ideas is referred to as a compound sentence.

One way to punctuate a compound sentence correctly is to join the two independent clauses with a semicolon and a coordinating conjunction.

2.The idea of placing meat on a bun, however, came from the United States. - simple sentence

A simple sentence is a form of sentence which has one independent clause and has no dependent clauses. It can stand alone for its meaning as a sentence.

3. When the hamburger first arrived in the United States, it was eaten raw.- complex sentence

The complex sentence refers to the sentence which contains at least one dependent clause and an independent clause. A dependent clause is the clause which cannot stand alone in its meaning on the other hand independent clause refers to the phrase which can stand alone, though both have a subject and a verb.  

4. The French still prefer their meat rare, but the Germans eat raw hamburger meat. - compound sentence

5. Hamburgers first became popular among German immigrants who lived in Cincinnati.- complex sentence