Complex sentence: International Musical Day (IMD) is a parodic holiday created in 2010 by John Smith of Brisbane, Australia who proclaimed March 10 each year as the day when everyone in the world should turn their day into a live musical.
Split into simpler sentences: International Musical Day (IMD) is a parodic holiday created in 2010. It was proclaimed March 10 each year as the day when everyone in the world should turn their day into a live musical.