Complex sentence: During his visit Herwegh was also given an audience with King Frederick William IV whose curiosity had been aroused and who, directly following the audience, placed a ban on "Deutschen Boten aus ser Schweiz".
Split into simpler sentences: During his visit Herwegh was also given an audience with King Frederick William IV whose curiosity had been aroused. Directly following the audience, he ordered a ban on "Deutschen Boten aus ser Schweiz".