Complex sentence: T-Mobile USA, Inc. is an American mobile network operator, headquartered in Bellevue, Washington, that provides wireless voice, messaging and data services in the United States, Puerto Rico and the U.S. Virgin Islands.
Split into simpler sentences: T-Mobile USA, Inc. is an American mobile network operator, headquartered in Bellevue, Washington. It provides wireless voice, messaging, and data services in the United States, Puerto Rico and the U.S. Virgin Islands.