Which sentence is an example of a simple sentence pattern?

1.After John heard the news, he left.
2.John left the room.
3.John left the room, and the room seemed empty.

sentence #2

Explanation:

A VERY SIMPLE explanation

A simple sentence is an independent clause that expresses a complete thought.

Sentence #1 is a complex sentence; it is made up of a dependent clause and an independent clause.

Sentence #3 is a compound sentence; it has two simple sentences (independent clauses) connected together.

I could elaborate with much more information, but that might be too much information for this simple - no pun intended - question.  

judy jones is an attractive woman who receives attention from many men throughout the story.   despite her beautiful appearance, she is superficial and callous.   she is an aggressive woman who goes after any man she desires but she is not happy.   she is fickle and is never satisfied.   her beauty is only skin deep.   dexter breaks down because he knows his dreams are unattainable.   he believes that wealth and physical beauty are what will make him happy.   he soon realizes that she has lost her attractive looks.   it is not all what he had planned.

the anecdote makes readers feel sorry for the man’s lack of heritage, then reminds readers that the man has an equally valuable heritage.