Original: He was Foreign Minister of the Federal Republic of Germany from 1974 to 1982 and, after a two-week pause, from 1982 to 1992, making him Germany's longest serving Foreign Minister and Vice Chancellor.
Simplified: Gensher was Foreign Minister and Vice Chancellor of Germany from 1974 to 1982 under Helmut Schmidt. He was Germany's longest serving Foreign Minister and Vice Chanellor of Germany|Vice Chancellor.