What is the difference between a simple sentence and a compound sentence in terms of their grammatical structure?

Sure, here's the difference between a simple sentence and a compound sentence:

Simple Sentence:

• A single independent clause.
• Contains a subject and a predicate.
• Cannot stand alone as a complete thought.

Compound Sentence:

• Two or more independent clauses joined by a coordinating conjunction.
• Contains a subject and a predicate for each clause.
• Can stand alone as a complete thought.

Examples:

Simple Sentence:

• The dog barked.

Compound Sentence:

• The dog barked at the mailman.
• The dog barked because it was hungry.

In summary, a simple sentence is a sentence with a single independent clause, while a compound sentence is a sentence with two or more independent clauses joined by a coordinating conjunction.