Simple subjects are usually one word. Names of persons, titles, or proper nouns (John F. Kennedy, President Washington, The X-Files) may also be simple subjects.

Example: Tom will be at the Main Street McDonald’s today.

Complex/complete subjects are noun phrases that include modifiers of the simple subject, such as the fluffy bunny. Modifiers that describe the simple subject are not always adjectives or the articles a or the. Below are examples of complete subjects that include other types of modifiers.

Examples: The cowboy from Texas (prepositional phrase)
The woman who eats bananas (relative clause)

Compound subjects consist of multiple parts linked by conjunctions. Look at the following examples (the simple subjects are underlined; the remaining parts of the subjects are bracketed):

Examples: [ He and John] are both Masons.
[A scruffy dog and an emaciated cat] have taken up residence under the porch.
[Either Dave or his parents] will give you the money order.