Complex sentence: Cellco Partnership, doing business as Verizon Wireless, is the largest mobile network operator in the United States, providing wireless services to 116.8 million subscribers as of Q1 2013.
Split into simpler sentences: Cellco Partnership, doing business as Verizon Wireless, is the largest mobile network operator in the United States. Providing wireless services to 116.8 million subscribers as of Q1 2013.