Complex sentence: In her 1986 campaign, Orr had pledged not to raise taxes; however, in 1987, the state legislature had passed a measure changing its algorithm for calculating personal income tax, which had resulted in a tax increase of about $20 million.
Split into simpler sentences: In her 1986 campaign, Orr had pledged not to raise taxes. However, in 1987 the state legislature had passed a measure changing its algorithm for calculating personal income tax, which had resulted in a tax increase of about $20 million.