Complex sentence: In May of 2013 Spirit airlines dropped it's 1-800 number and switched to a Salt Lake city number (area code 801), it's call center is located in Albuquerque, NM and operated by call center company, Sitel.
Split into simpler sentences: In May of 2013 Spirit airlines dropped its 1-800 number and switched to a Salt Lake city number (area code 801). Its call center is located in Albuquerque, NM and operated by call center company, Sitel.