Complex sentence: They found that the time devoted to fundraising tended to increase with the amount of funds raised and the level of the office with 23.3 percent of candidates for statewide office spending over half their time fundraising and 55 percent spending over a quarter of their time.
Split into simpler sentences: They found that the time devoted to fundraising tended to increase with the amount of funds raised and the level of the office. They estimated that 23.3 percent of candidates for statewide office spend over half their time fundraising and 55 percent spend over a quarter of their time.