Complex sentence: With Guido Holzknecht (1872-1931) he was co-founder of the "Wiener Röntgengesellschaft" (Vienna Radiology Society) and was elected president of the Austrian Radiology Society in 1934 and honorary president of that body after the Second World War.
Split into simpler sentences: With Guido Holzknecht (1872-1931) he was co-founder of the "Wiener Röntgengesellschaft" (Vienna Radiology Society). He was elected president of the Austrian Radiology Society in 1934 and honorary president of that body after the Second World War.