I believe that would be a compound sentence. A compound sentence has two subjects (Sally John) that is joined by a comma, semicolon, or conjunction (and). A simple sentence wouldn't have a conjunction in there. An example of a simple sentence would be "I have a dog name Shia Laruff". A run-on sentence is when two sentences aren't joined together properly. An example of a run-on sentence would be "I love to play videogames I could stay up all night playing them".
