Complex sentence: He was able to reduce the basic rate of Income Tax from 25 to 23%, reduce government's share of GDP, and to reduce the budget deficit from £50.8 billion in 1993 to £15.5 billion in 1997.
Split into simpler sentences: He was able to reduce the basic rate of Income Tax from 25 to 23%, reduce government's share of GDP, and to halve the budget deficit. Which was £50.8 billion in 1993 and reduced to £15.5 billion in 1997.