original: Leicester is officially the largest city in the region and the largest conurbation is the Nottingham Urban Area.
simplifications: Leicester is the largest city, and Nottingham has the largest urban area in the region. Leicester is the largest city and the largest urban area in the Nottingham. Leicester is the largest conurbation around the Nottingham Urban Area and in the region. Leicester is officially the largest city in the region. The largest conurbation is the Nottingham Urban Area. Leicester is the largest city in the region. The largest conurbation is the Nottingham Urban Area. Leicester is the largest city in the region. It is the largest conurbation is the Nottingham Urban Area. Leicester is  the biggest city in the region and the largest conurbation is the Nottingham Urban Area. Leicester is the largest city in the region and the largest extended urban area is the Nottingham Urban Area. Officially, Leicester is the largest city in the region and the largest conurbation is the Nottingham Urban Area. Leicester is the biggest city in it's region