Complex sentence: It was founded by Roger Schawinski, a pioneer of local radio, but now it is owned by Tamedia, which also publishes the Tages-Anzeiger, one of the most important Swiss newspapers.
Split into simpler sentences: It was founded by Roger Schawinski, a pioneer of local radio. Today it is owned by Tamedia, the publisher of Tages-Anzeiger, one of the most important Swiss newspapers.