Complex sentence: Since the 1980 United States Census, except in the 1990s, Madigan has been the chief map maker of the legislative districts of the Illinois General Assembly and the United States Congress in Illinois and during reapportionment he designs the Illinois House districts to increase his majority.
Split into simpler sentences: Since the 1980 United States Census, Madigan has been the chief map maker for the legislative districts for the Illinois General Assembly and the United States Congress in Illinois. At each reapportionment, he designs the Illinois House districts to increase his majority.