Simplify the following text for a Grade 13 native English-speaking person.
Original: It joins PlaÃ a Espanya , in the Sants-Montju Ã c district of Barcelona with metropolitan area municipalities of L'Hospitalet de Llobregat , CornellÃ de Llobregat and Sant Boi .
Simplified: It joins PlaÃ a Espanya , in the Sants-Montju Ã c district of Barcelona with the metropolitan area cities of L'Hospitalet de Llobregat , CornellÃ de Llobregat and Sant Boi .