Complex sentence: Cumulus Media, Inc. (also known as Cumulus Broadcasting) is a large owner of radio stations in markets in the United States, operating 344 stations in 67 markets as of September 30,2007.
Split into simpler sentences: Cumulus Media, Inc. (also known as Cumulus Broadcasting) is a large owner of radio stations in markets in the United States. Cumulus had 344 stations in 67 markets as of September 30,2007.