Robert Rimmer was a man who wrote books. Books are like really long, big stories. Some of the stories he wrote were about people who live in a different way than most people do. He wrote about things like sharing everything with other people, even your house and your husband or wife. This is called "communal living."
Some people liked his books a lot and thought they were very interesting. Other people did not like them because they thought they were strange and different from how they lived their own lives. Either way, Robert Rimmer was a writer who wrote about different ways of living and thinking, and he had people who both liked and did not like his ideas.