Original sentence: In these roles, he became one of the closest economic advisers of Engelbert Dollfuss, the "austrofascist" but strongly anti-Nazi Austrian Chancellor, and later to Otto von Habsburg, the Christian democratic politician and claimant to the throne of Austria (which had been legally abolished in 1918)
Edited sentence: In these roles, he became one of the closest economic advisers of Engelbert Dollfuss, the fascist but strongly anti-nazi Austrian Chancellor, and later to Otto von Habsburg, the Christian democratic politician and pretender to the throne of Austria (which had been legally abolished in 1918)