Complex sentence: Although the Nazi regime banned the anthroposophy, the investigation with disabled children could be continued in Hamborn until June 1941, thanks to the mediation of George Moritz; he counted with the protection of Rudolf Hess who until 1941 was a supporter of the anthroposophy.
Split into simpler sentences: Although the Nazi regime banned anthroposophy, the research with disabled children was allowed to continue in Hamborn until June 1941, thanks to the mediation of George Moritz. He counted on the protection of Rudolf Hess who until 1941 was a supporter of the anthroposophy.