Complex sentence: However, at the end of that season a dispute with Gilera left him without a bike, and only two years later Moto Morini gave him again the possilbity to race again, this time in the 250cc class.
Split into simpler sentences: However, at the end of the season, a dispute with the Gilera factory left him without a ride. Two years later Moto Morini gave him the opportunity to race again, this time in the 250cc class.