Complex sentence: Its leader Pavol Rusko is the founder and former owner of Markíza (the biggest commercial TV channel in Slovakia) and he was the Minister of Economics from September 24,2003 to August 24,2005.
Split into simpler sentences: Its leader Pavol Rusko was also the founder and former owner of Markíza (the biggest commercial TV channel in Slovakia). Rusko later became the Minister of Economics from September 24,2003 to August 24,2005.