Complex sentence: She quickly established herself as a competent politician, being appointed the Leader of the Labour Group in 1992 and later serving as the Leader of the Council until her election to Parliament in the United Kingdom general election, 1997.
Split into simpler sentences: She quickly established herself as a competent politician, being appointed the Leader of the Labour Group in 1992 and later serving as the Leader of the Council until her election to Parliament in 1997. She was first elected to Parliament in the United Kingdom general election, 1997.