Complex sentence: In 2009 it took place at Technopolis and another 15 venues over a period of five days, and in 2010 the designated venue is Ellinikos Kosmos as well as another 20 venues.
Split into simpler sentences: In 2009 it took place at Technopolis as well as 15 additional venues over a period of five days. The main 2010 venue is Ellinikos Kosmos as well as another 20 venues.