Complex sentence: Free Silver was an important political issue in the late 19th century and early 20th century United States about whether to have an inflationary monetary policy by "free coinage of silver"; its supporters were called silverites.
Split into simpler sentences: Free Silver was an important political issue in the late 19th century and early 20th century United States. Its advocates were in favor of an inflationary monetary policy by "free coinage of silver"; its supporters were called silverites.