Simplify the following text for a Grade 13 native English-speaking person.
Original: A conurbation is a region comprising a number of cities , large towns , and other urban areas that , through population growth and physical expansion , have merged to form one continuous urban and industrially developed area .
Simplified: A conurbation is an urban area that includes a number of cities , towns and villages which , through population growth and expansion , have physically merged to form one continuous built up area .