Complex sentence: The city of Vancouver, Washington voted in 1999 to adopt instant runoff voting and the state legislature enacted enabling legislation in 2004, but the city in 2006 chose not to exercise its option.
Split into simpler sentences: The city of Vancouver, Washington voted in 1999 to adopt instant runoff voting. The state legislature enacted enabling legislation in 2004, but the city in 2006 chose not to exercise its option.