Final answer:
The sentence 'Mr. Griffin runs a pet store, and his children help him.' is an example of a compound sentence. This is because it contains two independent clauses joined by a coordinating conjunction, which is 'and' in this case. Each clause could stand alone as a sentence: 'Mr. Griffin runs a pet store.' and 'His children help him.'
Step-by-step explanation:
The sentence structure in the given sentence is a compound sentence. A compound sentence consists of two or more independent clauses joined by coordinating conjunctions, such as 'and' or 'but.'
In this case, the independent clauses are 'Mr. Griffin runs a pet store' and 'his children help him.'
Example: Mr. Griffin runs a pet store and his children help him.