Question

What is the definition for simple subjects and complete subjects and how do you identify them?

Answer 1

I believe this should help you plenty :) http://www.powayusd.com/teachers/kfarrer/Grammar/Holt%20Handbook/Holt%20Chapter%201/complete_and_simple_subjects_and%20predicates.htm

Answer 2

http://www.education.com/reference/article/complete-simple-subjects/
I think this may help you.

Answer 3

complete subject is the subject and all the modifiers it may have for example :THREATNING SKIES changed our picnic plans. the capitalized words are consistuing a complete sentence.
Simple sentence is just the subject without modifiers . example: threatning SKIES changed our picnic planes