What are the examples of long and short sentences?

An example of a very short sentence (vss) would be:

Have you seen it?

or

How are you?

Basically a vss should be five or less Words.

An exapmle of a very long sentence would be:

Two very kind,polite girls were pulling a their dog in a red wagon to the community park, but stopped to talk to their friends.

Hope this helped!