Simplify the following text for a Grade 4 native English-speaking person.
Original: The Lamborghini MurciÃ lago R-GT is a race-only version of the MurciÃ lago , developed jointly with Reiter Engineering and Audi Sport .
Simplified: The Lamborghini MurciÃ lago is a sport car that was built by Lamborghini from 2001 to 2010 . The MurciÃ lago is named after a type of fighting bull .