Complex sentence: In 2003, Diogenes Verlag published his first novel, "Fünfunddreissig" (literally, "Thirty-five") which became a bestseller and was translated into several languages.
Split into simpler sentences: In 2003, Diogenes Verlag published his first novel, "Fünfunddreissig" (literally, "Thirty-five"). It became a bestseller and was translated into several languages.