Complex sentence: Before starting the final leg extension in 2008, the network measure 69.7 km. Operators of trams is the public transport company of the city of Brno-City of Brno "DOPRAVNÍ podnik (dpmb)".
Split into simpler sentences: Before starting the final leg of the extension in 2008, the entire network was made up of 69.7 km of track. The trams are operated by the City of Brno, "DOPRAVNÍ podnik (dpmb)".