Complex sentence: In 1981 education consumed 20 percent of the state budget, and by 1985 27 percent (511,200) of the country's population was enrolled in educational institutions from primary through university levels.
Split into simpler sentences: In 1981 education consumed 20 percent of the state budget. By 1985 27 percent (511,200) of the country's population was enrolled in educational institutions from primary through university levels.