What is a simple subject and a complete subject?

A simple subject is the noun or pronoun that the sentence is about.

A complete subject may be a noun, pronoun, a noun phrase, or a noun clause.

Explanation:

"John walked his dog."

- the simple subject is the noun "John"

- the complete subject is the noun "John"

"It was a dachshund."

- the simple subject is the pronoun "it"

- the complete subject is the pronoun "it"

The house needs painting.

- the simple subject is the noun "house"

- the complete subject is the noun phrase "the house"

A good coat of paint will make a big difference.

- the simple subject is the noun "coat"

- the complete subject is noun phrase "a good coat of paint"

Someone to help us will make the job go quickly.

- the simple subject is the pronoun "someone"

- the complete subject is the noun clause "someone to help us'

explanation:

because i dont know

imparadis't in one anothers arms  

the happier eden, shall enjoy their fill  

of bliss on bliss, while i to hell am thrust,  

where neither joy nor love, but fierce desire,  

among our other torments not the least,  

still unfulfill'd with pain of longing pines;  

yet let me not forget what i have gain'd  

from their own mouths; all is not theirs it seems:  

one fatal tree there stands of knowledge call'd,  

forbidden them to taste: knowledge forbidd'n?  

suspicious, reasonless. why should their lord  

envie them that? can it be sin to know,