Complex sentence: Most editors here at the English Wikipedia include only editors in their concept, such as the registered editors who have made an edit during the last month, even though most of the article writing is done by unregistered (IP) editors.
Split into simpler sentences: Most editors here at the English Wikipedia include only editors in their concept. Many, in fact, only include the registered editors who have made an edit during the last month, even though most of the article writing is done by unregistered (IP) editors.