Complex sentence: An example of a 10-10 Dial around could be as follows: a caller may have AT&T as their assigned long Distance Carrier with their Local Exchange Carrier (LEC), also known as a regional Bell Operating Company (RBOC).
Split into simpler sentences: An example of a 10-10 Dial around could be as follows. I may have AT&T as my assigned long Distance Carrier with my Local Exchange Carrier (LEC), also known as a regional Bell Operating Company (RBOC).