Complex sentence: State-owned TVR and the private stations Pro TV and Antena 1 command the lion's share of viewing, however there is a large number of smaller, private stations, some of them part of local networks.
Split into simpler sentences: State-owned TVR and the private stations Pro TV and Antena 1 command the lion's share of viewing. There is a large number of smaller, private stations, some of them part of local networks.