Complex sentence: In 1993, the ACT rate was cut to 22.5% while the tax rate on dividend income was set at 20%, for the first time set at a different rate to that payable on other income (25%).
Split into simpler sentences: In 1993, the ACT rate was cut to 22.5%. At the same time the rate of income tax payable on dividends (20%) was for the first time set at a different rate to that payable on other income (25%).