Complex sentence: A feature of the establishment, in October 1990, of the Federal Commission for the Stasi Records (BStU) was the inclusion, intentionally, of numerous senior Stasi employees, but at the same time large numbers of unrecognized Informal Collaborators were also recruited.
Split into simpler sentences: A feature of the establishment, in October 1990, of the Federal Commission for the Stasi Records (BStU) was the inclusion, intentionally, of numerous senior Stasi employees. However, at the same time large numbers of unrecognized Informal Collaborators were also recruited.