Complex sentence: February 29 is the feast day of San Precario, the patron saint of precarious workers, who--together with his feast day--was created by the Chainworkers at the Milanese space Reload where the 2004 EuroMayDay was organised with others, including the Critical Mass group.
Split into simpler sentences: February 29 is the day of San Precario, the patron saint of precarious workers. He was created by the Chainworkers at the Milanese space Reload where the 2004 EuroMayDay was organised with others including the Critical Mass group.