Don’t separate a subject from its verb

See this simple sentence: The dog bit the cat. It's built of these basic bits: The dog [subject] bit [verb] the cat [object]. You would never dream of putting a comma after the subject and before the verb: The dog, bit the cat. [No. You wouldn't do this, would you?] But when the subject is a longer noun phrase, many people (I catch myself sometimes) will want to add a comma after the subject, just it feels like there should be a pause...