Complex sentence: In 1967, The European Broadcasting Union invited Durbridge to write an original radio serial for the international market-- "La Boutique"--which was broadcast in more than fifteen countries, and in a variety of languages.
Split into simpler sentences: In 1967, the European Broadcasting Union invited Durbridge to write an original radio serial for the international market, "La Boutique". This was broadcast in more than fifteen countries, and in a variety of languages.