Complex sentence: It distributed large quantities of colorful and professionally produced publicity material about life in the GDR to its listeners, using transmitters at Leipzig, Königs-Wusterhausen, and Nauen.
Split into simpler sentences: It distributed large quantities of colorful and professionally produced publicity material about life in the GDR to its listeners. RBI used transmitters at Leipzig, Königs-Wusterhausen, and Nauen.