Simplify the following text for a Grade 11 native English-speaking person.
Original: Line 1 , shortened to L1 and known as `` Hospital de Bellvitge - Fondo '' , colored red and often simply called LÃ nia vermella ( `` Red Line '' ) , is the second oldest metro line in Barcelona , after L3 .
Simplified: â '' Line 1 , shortened to L1 and known as `` Hospital de Bellvitge - Fondo '' , colored red and often simply called LÃ nia vermella ( `` Red Line '' ) , is the second oldest metro line in Barcelona , after L3 .