Complex sentence: His success at the Girobio led to him turning professional until the end of the 1992 season with Davide Boifava's, finishing 12th in his first professional race, the Gran Premio Città di Camaiore.
Split into simpler sentences: His success at the Girobio led to him turning professional until the end of the 1992 season with Davide Boifava's. He finished 12th in his first professional race, the Gran Premio Città di Camaiore.