Complex sentence: Sasse was cofounder of the "Documentation of Endangered Languages" Initiative of the Volkswagen Foundation, Founding President of the Society for Endangered Languages and (from 2001) a full member of the North Rhine Westphalia Academy of Sciences, Humanities, and the Arts.
Split into simpler sentences: Sasse was cofounder of the "Documentation of Endangered Languages" Initiative of the Volkswagen Foundation, Founding President of the Society for Endangered Languages. His prominence in the field was recognized in 2001 when he was elected a full member of the North Rhine Westphalia Academy of Sciences, Humanities, and the Arts.