Identifying the Simple Subject Part 1

A simple subject is a subject that has just one noun or pronoun as the focus of the sentence. This means that only one noun or pronoun does the action, or connects, to the verb of the sentence.
 

A slice of tasty berry pie would make Sarah happy.
 

Here, the full subject is “A slice of tasty berry pie.” There are many words like a or tasty or pie that modify the main subject, which is the word slice. So, slice is the simple subject.