Complex sentence: Marine Aviation Logistics Squadron 42 is a reserve aviation logistics support unit of the United States Marine Corps, part of Marine Aircraft Group 42 and 4th Marine Aircraft Wing and are currently based at Naval Air Station Atlanta.
Split into simpler sentences: Marine Aviation Logistics Squadron 42 is a reserve aviation logistics support unit of the United States Marine Corps. They fall under the command of Marine Aircraft Group 42 and 4th Marine Aircraft Wing and are currently based at Naval Air Station Atlanta.