Complex sentence: The Verizon Center (formerly MCI Center) is a sports and entertainment arena in Washington, D.C., USA, named after telecommunications sponsor Verizon Communications, and has been nicknamed the "Phone Booth" because of its association with telecommunications companies.
Split into simpler sentences: The Verizon Center (formerly MCI Center) is a sports and entertainment arena in Washington, D.C., USA, named after telecommunications sponsor Verizon Communications. The arena has been nicknamed the "Phone Booth" because of its association with telecommunications companies.