If people create another account because they are banned, try to mute this person.
"Mute a post Have you ever commented on something only to have the following comments spiral out of control or stray off into unrelated topics? This is why we created the ability to mute a post." Here is the link for more information https://support.google.com/plus/answer/1253535?hl=en
Just click the arrow at the top right of the post.
Please excuse my bad English grammar and language syntax errors.
I am here to practice my English grammar, and I apologize or bad English grammar, but I will do my best on my English grammar. Also I already know that some people may trick me, because do the bad English grammar, but tricking someone may cause chaos trolls.