Complex sentence: After this development Jung recognised that his position was untenable and resigned as editor of the "Jarhbuch" and then as president of the IPA in April 1914; the Zürich Society withdrew from the IPA the following July.
Split into simpler sentences: After this development, Jung recognised that his position was untenable and resigned as editor of the "Jarhbuch" and then as president of the IPA in April 1914. The Zürich Society withdrew from the IPA the following July.