Original: She was especially involved in ; ` working circle explosives ' in which she achieved limited success with Siegfried Hausner when they managed to manufacture a small amount of TNT in December 1970 in the University Institute of Physiology .
Simplified: Siegfried Hausner 1952 1975 Student member of the SPK and later the RAF , especially involved in the ` working circle explosives . She was especially involved in ; ` working circle explosives ' .