Complex sentence: From june 2000 to march 2001 she was chairperson of Alliance 90/The Greens on the national level and resigned with her becoming minister in the first Schröder coalition in 2001.
Split into simpler sentences: From June 2000 to March 2001 she was chairperson of Bündnis 90/Die Grünen on the national level. She resigned with her becoming minister in the first Schröder coalition in 2001.