Complex sentence: In 999, Emperor Otto III assigned the "province" of Gera to the Quedlinburg Abbey, whose abbesses assigned the protectorship of this area in 1209 to the Vogts of Weida (in German: "Vögte von Weida") who served as its administrators.
Split into simpler sentences: In 999, Emperor Otto III assigned the "province" of Gera to the Quedlinburg Abbey. In turn, the church assigned the protectorship of this area in 1209 to the Vogts of Weida (in German: "Vögte von Weida") who served as its administrators.