Complex sentence: The 1950 Grand Prix motorcycle racing season was the 2nd F.I.M. Road Racing World Championship season, with six Grands Prix and five classes, 500cc, 350cc, 250cc, 125cc and Sidecars 600cc.
Split into simpler sentences: The 1950 Grand Prix motorcycle racing season was the 2nd F.I.M. Road Racing World Championship season. The season consisted of six Grand Prix races in five classes 500cc, 350cc, 250cc, 125cc and Sidecars 600cc.